Engineering

Applied science and research

For other uses, see Engineering (disambiguation).

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The steam engine, the major driver in the Industrial Revolution, underscores the importance of engineering in modern history. This beam engine is on display in the Technical University of Madrid. Engineering

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Engineering is the practice of using natural science, mathematics, and the engineering design process[1] to solve problems within technology, increase efficiency and productivity, and improve systems. Modern engineering comprises many subfields which include designing and improving infrastructure, machinery, vehicles, electronics, materials, and energy systems.[2]

The discipline of engineering encompasses a broad range of more specialized fields of engineering, each with a more specific emphasis for applications of mathematics and science. See glossary of engineering.

The word engineering is derived from the Latin ingenium.[3]

## Definition

[edit]

The American Engineers' Council for Professional Development (the predecessor of the Accreditation Board for Engineering and Technology aka ABET)[4] has defined "engineering" as:

> The creative application of scientific principles to design or develop structures, machines, apparatus, or manufacturing processes, or works utilizing them singly or in combination; or to construct or operate the same with full cognizance of their design; or to forecast their behavior under specific operating conditions; all as respects an intended function, economics of operation and safety to life and property.[5][6]

## History

[edit]

Main article: History of engineering

Relief map of the Citadel of Lille, designed in 1668 by Vauban, the foremost military engineer of his age

Engineering has existed since ancient times, when humans devised inventions such as the wedge, lever, wheel and pulley, etc.

The term engineering is derived from the word engineer, which itself dates back to the 14th century when an engine'er (literally, one who builds or operates a siege engine) referred to "a constructor of military engines".[7] In this context, now obsolete, an "engine" referred to a military machine, i.e., a mechanical contraption used in war (for example, a catapult). Notable examples of the obsolete usage which have survived to the present day are military engineering corps, e.g., the U.S. Army Corps of Engineers.

The word "engine" itself is of even older origin, ultimately deriving from the Latin ingenium (c. 1250), meaning "innate quality, especially mental power, hence a clever invention."[8]

Later, as the design of civilian structures, such as bridges and buildings, matured as a technical discipline, the term civil engineering[6] entered the lexicon as a way to distinguish between those specializing in the construction of such non-military projects and those involved in the discipline of military engineering.

### Ancient era

[edit]

The Ancient Romans built aqueducts to bring a steady supply of clean and fresh water to cities and towns in the empire.

The pyramids in ancient Egypt, ziggurats of Mesopotamia, the Acropolis and Parthenon in Greece, the Roman aqueducts, Via Appia and Colosseum, Teotihuacán, and the Brihadeeswarar Temple of Thanjavur, among many others, stand as a testament to the ingenuity and skill of ancient civil and military engineers. Other monuments, no longer standing, such as the Hanging Gardens of Babylon and the Pharos of Alexandria, were important engineering achievements of their time and were considered among the Seven Wonders of the Ancient World.

The six classic simple machines were known in the ancient Near East. The wedge and the inclined plane (ramp) were known since prehistoric times.[9] The wheel, along with the wheel and axle mechanism, was invented in Mesopotamia (modern Iraq) during the 5th millennium BC.[10] The lever mechanism first appeared around 5,000 years ago in the Near East, where it was used in a simple balance scale,[11] and to move large objects in ancient Egyptian technology.[12] The lever was also used in the shadoof water-lifting device, the first crane machine, which appeared in Mesopotamia c. 3000 BC,[11] and then in ancient Egyptian technology c. 2000 BC.[13] The earliest evidence of pulleys date back to Mesopotamia in the early 2nd millennium BC,[14] and ancient Egypt during the Twelfth Dynasty (1991–1802 BC).[15] The screw, the last of the simple machines to be invented,[16] first appeared in Mesopotamia during the Neo-Assyrian period (911–609) BC.[14] The Egyptian pyramids were built using three of the six simple machines, the inclined plane, the wedge, and the lever, to create structures like the Great Pyramid of Giza.[17]

The earliest civil engineer known by name is Imhotep.[6] As one of the officials of the Pharaoh, Djosèr, he probably designed and supervised the construction of the Pyramid of Djoser (the Step Pyramid) at Saqqara in Egypt around 2630–2611 BC.[18] The earliest practical water-powered machines, the water wheel and watermill, first appeared in the Persian Empire, in what are now Iraq and Iran, by the early 4th century BC.[19]

Kush developed the Sakia during the 4th century BC, which relied on animal power instead of human energy.[20] Hafirs were developed as a type of reservoir in Kush to store and contain water as well as boost irrigation.[21] Sappers were employed to build causeways during military campaigns.[22] Kushite ancestors built speos during the Bronze Age between 3700 and 3250 BC.[23] Bloomeries and blast furnaces were also created during the 7th centuries BC in Kush.[24][25][26][27]

Ancient Greece developed machines in both civilian and military domains. The Antikythera mechanism, an early known mechanical analog computer,[28][29] and the mechanical inventions of Archimedes, are examples of Greek mechanical engineering. Some of Archimedes' inventions, as well as the Antikythera mechanism, required sophisticated knowledge of differential gearing or epicyclic gearing, two key principles in machine theory that helped design the gear trains of the Industrial Revolution, and are widely used in fields such as robotics and automotive engineering.[30]

Ancient Chinese, Greek, Roman and Hunnic armies employed military machines and inventions such as artillery which was developed by the Greeks around the 4th century BC,[31] the trireme, the ballista and the catapult, the trebuchet by Chinese circa 6th-5th century BCE.[32]

### Middle Ages

[edit]

The earliest practical wind-powered machines, the windmill and wind pump, first appeared in the Muslim world during the Islamic Golden Age, in what are now Iran, Afghanistan, and Pakistan, by the 9th century AD.[33][34][35][36] The earliest practical steam-powered machine was a steam jack driven by a steam turbine, described in 1551 by Taqi al-Din Muhammad ibn Ma'ruf in Ottoman Egypt.[37][38]

The cotton gin was invented in India by the 6th century AD,[39] and the spinning wheel was invented in the Islamic world by the early 11th century,[40] both of which were fundamental to the growth of the cotton industry. The spinning wheel was also a precursor to the spinning jenny, which was a key development during the early Industrial Revolution in the 18th century.[41]

The earliest programmable machines were developed in the Muslim world. A music sequencer, a programmable musical instrument, was the earliest type of programmable machine. The first music sequencer was an automated flute player invented by the Banu Musa brothers, described in their Book of Ingenious Devices, in the 9th century.[42][43] In 1206, Al-Jazari invented programmable automata/robots. He described four automaton musicians, including drummers operated by a programmable drum machine, where they could be made to play different rhythms and different drum patterns.[44]

A water-powered mine hoist used for raising ore, Germany, c. 1556

Before the development of modern engineering, mathematics was used by artisans and craftsmen, such as millwrights, clockmakers, instrument makers and surveyors. Aside from these professions, universities were not believed to have had much practical significance to technology.[45]: 32

A standard reference for the state of mechanical arts during the Renaissance is given in the mining engineering treatise De re metallica (1556), which also contains sections on geology, mining, and chemistry. De re metallica was the standard chemistry reference for the next 180 years.[45]

### Modern era

[edit]

The application of the steam engine allowed coke to be substituted for charcoal in iron making, lowering the cost of iron, which provided engineers with a new material for building bridges. This bridge was made of cast iron, which was soon displaced by less brittle wrought iron as a structural material.

The science of classical mechanics, sometimes called Newtonian mechanics, formed the scientific basis of much of modern engineering.[45] With the rise of engineering as a profession in the 18th century, the term became more narrowly applied to fields in which mathematics and science were applied to these ends. Similarly, in addition to military and civil engineering, the fields then known as the mechanic arts became incorporated into engineering.

Canal building was an important engineering work during the early phases of the Industrial Revolution.[46]

John Smeaton was the first self-proclaimed civil engineer and is often regarded as the "father" of civil engineering. He was an English civil engineer responsible for the design of bridges, canals, harbors, and lighthouses. He was also a capable mechanical engineer and an eminent physicist. Using a model water wheel, Smeaton conducted experiments for seven years, determining ways to increase efficiency.[47]: 127 Smeaton introduced iron axles and gears to water wheels.[45]: 69 Smeaton also made mechanical improvements to the Newcomen steam engine. Smeaton designed the third Eddystone Lighthouse (1755–59) where he pioneered the use of 'hydraulic lime' (a form of mortar which will set under water) and developed a technique involving dovetailed blocks of granite in the building of the lighthouse. He is important in the history, rediscovery of, and development of modern cement, because he identified the compositional requirements needed to obtain "hydraulicity" in lime; work which led ultimately to the invention of Portland cement.

Applied science led to the development of the steam engine. The sequence of events began with the invention of the barometer and the measurement of atmospheric pressure by Evangelista Torricelli in 1643, demonstration of the force of atmospheric pressure by Otto von Guericke using the Magdeburg hemispheres in 1656, laboratory experiments by Denis Papin, who built experimental model steam engines and demonstrated the use of a piston, which he published in 1707. Edward Somerset, 2nd Marquess of Worcester published a book of 100 inventions containing a method for raising waters similar to a coffee percolator. Samuel Morland, a mathematician and inventor who worked on pumps, left notes at the Vauxhall Ordinance Office on a steam pump design that Thomas Savery read. In 1698 Savery built a steam pump called "The Miner's Friend". It employed both vacuum and pressure.[48] Iron merchant Thomas Newcomen, who built the first commercial piston steam engine in 1712, was not known to have any scientific training.[47]: 32

Jumbo Jet

The application of steam-powered cast iron blowing cylinders for providing pressurized air for blast furnaces lead to a large increase in iron production in the late 18th century. The higher furnace temperatures made possible with steam-powered blast allowed for the use of more lime in blast furnaces, which enabled the transition from charcoal to coke.[49] These innovations lowered the cost of iron, making horse railways and iron bridges practical. The puddling process, patented by Henry Cort in 1784 produced large scale quantities of wrought iron. Hot blast, patented by James Beaumont Neilson in 1828, greatly lowered the amount of fuel needed to smelt iron. With the development of the high pressure steam engine, the power to weight ratio of steam engines made practical steamboats and locomotives possible.[50] New steel making processes, such as the Bessemer process and the open hearth furnace, ushered in an area of heavy engineering in the late 19th century.

One of the most famous engineers of the mid-19th century was Isambard Kingdom Brunel, who built railroads, dockyards and steamships.

Offshore platform, Gulf of Mexico

The Industrial Revolution created a demand for machinery with metal parts, which led to the development of several machine tools. Boring cast iron cylinders with precision was not possible until John Wilkinson invented his boring machine, which is considered the first machine tool.[51] Other machine tools included the screw cutting lathe, milling machine, turret lathe and the metal planer. Precision machining techniques were developed in the first half of the 19th century. These included the use of gigs to guide the machining tool over the work and fixtures to hold the work in the proper position. Machine tools and machining techniques capable of producing interchangeable parts lead to large scale factory production by the late 19th century.[52]

The United States Census of 1850 listed the occupation of "engineer" for the first time with a count of 2,000.[53] There were fewer than 50 engineering graduates in the U.S. before 1865. The first PhD in engineering (technically, applied science and engineering) awarded in the United States went to Josiah Willard Gibbs at Yale University in 1863; it was also the second PhD awarded in science in the U.S.[54] In 1870 there were a dozen U.S. mechanical engineering graduates, with that number increasing to 43 per year in 1875. In 1890, there were 6,000 engineers in civil, mining, mechanical and electrical.[50] There was no chair of applied mechanism and applied mechanics at Cambridge until 1875, and no chair of engineering at Oxford until 1907. Germany established technical universities earlier.[55]

The foundations of electrical engineering in the 1800s included the experiments of Alessandro Volta, Michael Faraday, Georg Ohm and others and the invention of the electric telegraph in 1816 and the electric motor in 1872. The theoretical work of James Maxwell (see: Maxwell's equations) and Heinrich Hertz in the late 19th century gave rise to the field of electronics. The later inventions of the vacuum tube and the transistor further accelerated the development of electronics to such an extent that electrical and electronics engineers currently outnumber their colleagues of any other engineering specialty.[6] Chemical engineering developed in the late nineteenth century.[6] Industrial scale manufacturing demanded new materials and new processes and by 1880 the need for large scale production of chemicals was such that a new industry was created, dedicated to the development and large scale manufacturing of chemicals in new industrial plants.[6] The role of the chemical engineer was the design of these chemical plants and processes.[6] Originally deriving from the manufacture of ceramics and its putative derivative metallurgy, materials science is one of the oldest forms of engineering.[56] Modern materials science evolved directly from metallurgy, which itself evolved from the use of fire. Important elements of modern materials science were products of the Space Race; the understanding and engineering of the metallic alloys, and silica and carbon materials, used in building space vehicles enabling the exploration of space. Materials science has driven, and been driven by, the development of revolutionary technologies such as rubbers, plastics, semiconductors, and biomaterials.

The solar furnace at Odeillo in the Pyrénées-Orientales in France can reach temperatures up to 3,500 °C (6,330 °F).

Aeronautical engineering deals with aircraft design process design while aerospace engineering is a more modern term that expands the reach of the discipline by including spacecraft design. Its origins can be traced back to the aviation pioneers around the start of the 20th century although the work of Sir George Cayley has recently been dated as being from the last decade of the 18th century. Early knowledge of aeronautical engineering was largely empirical with some concepts and skills imported from other branches of engineering.[57] Only a decade after the successful flights by the Wright brothers, there was extensive development of aeronautical engineering through development of military aircraft that were used in World War I. Meanwhile, research to provide fundamental background science continued by combining theoretical physics with experiments.

## Branches of engineering

[edit]

For a topical guide, see Outline of engineering.

Hoover Dam

Engineering is a broad discipline that is often broken down into several sub-disciplines. Although most engineers will usually be trained in a specific discipline, some engineers become multi-disciplined through experience. Engineering is often characterized as having five main branches:[58][59][60] chemical engineering, civil engineering, electrical engineering, materials science and engineering, and mechanical engineering.

Below is a list of recognized branches of engineering. There are additional sub-disciplines as well.

Type of engineering  | Information

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Aerospace engineering  | Aerospace engineering covers the design, development, manufacture and operational behaviour of aircraft, satellites and rockets.
Agricultural engineering  | Agricultural engineering utilizes farm power and machinery, biological material processes, bioenergy, farm structures, and agricultural natural resources.
Biological engineering  | Biological engineering studies the application of principles of biology and the tools of engineering to create usable, tangible, economically viable products.
Biomedical engineering  | Biomedical engineering is the application of engineering principles and design concepts to medicine and biology for healthcare applications (e.g., diagnostic or therapeutic purposes).
Chemical engineering  | Chemical engineering is the application of chemical, physical, and biological sciences to developing technological solutions from raw materials or chemicals.
Civil engineering  | Civil engineering is the design and construction of public and private works, such as infrastructure (airports, roads, railways, water supply, and treatment etc.), bridges, tunnels, dams, and buildings.
Computer engineering  | Computer engineering integrates several fields of computer science and electronic engineering required to develop computer hardware and software.
Electrical engineering  | Electrical engineering focuses on the design, development, and application of systems and equipment that utilize electricity and electromagnetism.
Environmental engineering  | Environmental engineering is a specialized field that uses scientific and engineering principles to protect and improve the environment for human health and well-being.
Geological engineering  | Geological engineering is associated with anything constructed on or within the Earth by applying geological sciences and engineering principles to direct or support the work of other disciplines.
Industrial engineering  | Industrial engineering focuses on optimizing complex processes, systems, and organizations by improving efficiency, productivity, and quality.
Marine engineering  | Marine engineering covers the design, development, manufacture and operational behaviour of watercraft and stationary structures like oil platforms and ports.
Materials engineering  | Materials engineering is the application of material science and engineering principles to understand the properties of materials.
Mechanical engineering  | Mechanical engineering comprises the design and analysis of heat and mechanical power for the operation of machines and mechanical systems.
Nuclear engineering  | Nuclear engineering is a multidisciplinary field that deals with the design, construction, operation, and safety of systems that utilize nuclear energy and radiation.
Software engineering  | Software engineering is a branch of both computer science and engineering focused on designing, developing, testing, and maintaining software applications. It is distinct from computer engineering.

## Interdisciplinary engineering

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Main article: List of engineering branches

Interdisciplinary engineering draws from more than one of the principle branches of the practice. Historically, naval engineering and mining engineering were major branches. Other engineering fields are manufacturing engineering, acoustical engineering, corrosion engineering, instrumentation and control, automotive, information engineering, petroleum, systems, audio, software, architectural, biosystems, and textile engineering.[61] These and other branches of engineering are represented in the 36 licensed member institutions of the UK Engineering Council.

New specialties sometimes combine with the traditional fields and form new branches – for example, Earth systems engineering and management involves a wide range of subject areas including engineering studies, environmental science, engineering ethics and philosophy of engineering.

## Practice

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Main article: Regulation and licensure in engineering

One who practices engineering is called an engineer, and those licensed to do so may have more formal designations such as Professional Engineer, Chartered Engineer, Incorporated Engineer, Ingenieur, European Engineer. There can also be what is called by the FAA a Designated Engineering Representative.[62]

## Methodology

[edit]

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Design of a turbine requires collaboration of engineers from many fields, as the system involves mechanical, electro-magnetic and chemical processes. The blades, rotor and stator as well as the steam cycle all need to be carefully designed and optimized.

In the engineering design process, engineers apply mathematics and sciences such as physics to find novel solutions to problems or to improve existing solutions. Engineers need proficient knowledge of relevant sciences for their design projects. As a result, many engineers continue to learn new material throughout their careers.

If multiple solutions exist, engineers weigh each design choice based on their merit and choose the solution that best matches the requirements. The task of the engineer is to identify, understand, and interpret the constraints on a design in order to yield a successful result. It is generally insufficient to build a technically successful product, rather, it must also meet further requirements.

Constraints may include available resources, physical, imaginative or technical limitations, flexibility for future modifications and additions, and other factors, such as requirements for cost, safety, marketability, productivity, and serviceability. By understanding the constraints, engineers derive specifications for the limits within which a viable object or system may be produced and operated.

### Problem solving

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A drawing for a steam locomotive. Engineering is applied to design, with emphasis on function and the utilization of mathematics and science.

Engineers use their knowledge of science, mathematics, logic, economics, and appropriate experience or tacit knowledge to find suitable solutions to a particular problem. Creating an appropriate mathematical model of a problem often allows them to analyze it (sometimes definitively), and to test potential solutions.[63]

More than one solution to a design problem usually exists so the different design choices have to be evaluated on their merits before the one judged most suitable is chosen. Genrich Altshuller, after gathering statistics on a large number of patents, suggested that compromises are at the heart of "low-level" engineering designs, while at a higher level the best design is one which eliminates the core contradiction causing the problem.[64]

Engineers typically attempt to predict how well their designs will perform to their specifications prior to full-scale production. They use, among other things: prototypes, scale models, simulations, destructive tests, nondestructive tests, and stress tests. Testing ensures that products will perform as expected but only in so far as the testing has been representative of use in service. For products, such as aircraft, that are used differently by different users failures and unexpected shortcomings (and necessary design changes) can be expected throughout the operational life of the product.[65]

Engineers take on the responsibility of producing designs that will perform as well as expected and, except those employed in specific areas of the arms industry, will not harm people. Engineers typically include a factor of safety in their designs to reduce the risk of unexpected failure.

The study of failed products is known as forensic engineering. It attempts to identify the cause of failure to allow a redesign of the product and so prevent a re-occurrence. Careful analysis is needed to establish the cause of failure of a product. The consequences of a failure may vary in severity from the minor cost of a machine breakdown to large loss of life in the case of accidents involving aircraft and large stationary structures like buildings and dams.[66]

### Computer use

[edit]

See also: Computational engineering

A computer simulation of high velocity air flow around a Space Shuttle orbiter during re-entry. Solutions to the flow require modelling of the combined effects of fluid flow and the heat equations.

As with all modern scientific and technological endeavors, computers and software play an increasingly important role. As well as the typical business application software there are a number of computer aided applications (computer-aided technologies) specifically for engineering. Computers can be used to generate models of fundamental physical processes, which can be solved using numerical methods.

Graphic representation of a minute fraction of the WWW, demonstrating hyperlinks

One of the most widely used design tools in the profession is computer-aided design (CAD) software. It enables engineers to create 3D models, 2D drawings, and schematics of their designs. CAD together with digital mockup (DMU) and CAE software such as finite element method analysis or analytic element method allows engineers to create models of designs that can be analyzed without having to make expensive and time-consuming physical prototypes.

These allow products and components to be checked for flaws; assess fit and assembly; study ergonomics; and to analyze static and dynamic characteristics of systems such as stresses, temperatures, electromagnetic emissions, electrical currents and voltages, digital logic levels, fluid flows, and kinematics. Access and distribution of all this information is generally organized with the use of product data management software.[67]

There are also many tools to support specific engineering tasks such as computer-aided manufacturing (CAM) software to generate CNC machining instructions; manufacturing process management software for production engineering; EDA for printed circuit board (PCB) and circuit schematics for electronic engineers; MRO applications for maintenance management; and Architecture, engineering and construction (AEC) software for civil engineering.

In recent years the use of computer software to aid the development of goods has collectively come to be known as product lifecycle management (PLM).[68]

## Social context

[edit]

Robotic Kismet can produce a range of facial expressions.

The engineering profession engages in a range of activities, from collaboration at the societal level, and smaller individual projects. Almost all engineering projects are obligated to a funding source: a company, a set of investors, or a government. The types of engineering that are less constrained by such a funding source, are pro bono, and open-design engineering.

Engineering has interconnections with society, culture and human behavior. Most products and constructions used by modern society, are influenced by engineering. Engineering activities have an impact on the environment, society, economies, and public safety.

Engineering projects can be controversial. Examples from different engineering disciplines include: the development of nuclear weapons, the Three Gorges Dam, the design and use of sport utility vehicles and the extraction of oil. In response, some engineering companies have enacted serious corporate and social responsibility policies.

The attainment of many of the Millennium Development Goals requires the achievement of sufficient engineering capacity to develop infrastructure and sustainable technological development.[69]

Radar, GPS, lidar, etc. are all combined to provide proper navigation and obstacle avoidance (vehicle developed for 2007 DARPA Urban Challenge).

Overseas development and relief NGOs make considerable use of engineers, to apply solutions in disaster and development scenarios. Some charitable organizations use engineering directly for development:

* Engineers Without Borders
* Engineers Against Poverty
* Registered Engineers for Disaster Relief
* Engineers for a Sustainable World
* Engineering for Change
* Engineering Ministries International[70]

Engineering companies in more developed economies face challenges with regard to the number of engineers being trained, compared with those retiring. This problem is prominent in the UK where engineering has a poor image and low status.[71] There are negative economic and political issues that this can cause, as well as ethical issues.[72] It is agreed the engineering profession faces an "image crisis".[73] The UK holds the most engineering companies compared to other European countries, together with the United States.[citation needed]

### Code of ethics

[edit]

Main article: Engineering ethics

Many engineering societies have established codes of practice and codes of ethics to guide members and inform the public at large. The National Society of Professional Engineers code of ethics states:

> Engineering is an important and learned profession. As members of this profession, engineers are expected to exhibit the highest standards of honesty and integrity. Engineering has a direct and vital impact on the quality of life for all people. Accordingly, the services provided by engineers require honesty, impartiality, fairness, and equity, and must be dedicated to the protection of the public health, safety, and welfare. Engineers must perform under a standard of professional behavior that requires adherence to the highest principles of ethical conduct.[74]

In Canada, engineers wear the Iron Ring as a symbol and reminder of the obligations and ethics associated with their profession.[75]

## Relationships with other disciplines

[edit]

### Science

[edit]

> Scientists study the world as it is; engineers create the world that has never been.

— Theodore von Kármán[76][77][78]

Engineers, scientists and technicians at work on target positioner inside National Ignition Facility (NIF) target chamber

There exists an overlap between the sciences and engineering practice; in engineering, one applies science. Both areas of endeavor rely on accurate observation of materials and phenomena. Both use mathematics and classification criteria to analyze and communicate observations.[citation needed]

Scientists may also have to complete engineering tasks, such as designing experimental apparatus or building prototypes. Conversely, in the process of developing technology, engineers sometimes find themselves exploring new phenomena, thus becoming, for the moment, scientists or more precisely "engineering scientists".[79]

The International Space Station is used to conduct science experiments in space.

In the book What Engineers Know and How They Know It,[80] Walter Vincenti asserts that engineering research has a character different from that of scientific research. First, it often deals with areas in which the basic physics or chemistry are well understood, but the problems themselves are too complex to solve in an exact manner.

There is a "real and important" difference between engineering and physics as similar to any science field has to do with technology.[81][82] Physics is an exploratory science that seeks knowledge of principles while engineering uses knowledge for practical applications of principles. The former equates an understanding into a mathematical principle while the latter measures variables involved and creates technology.[83][84][85] For technology, physics is an auxiliary and in a way technology is considered as applied physics.[86] Though physics and engineering are interrelated, it does not mean that a physicist is trained to do an engineer's job. A physicist would typically require additional and relevant training.[87] Physicists and engineers engage in different lines of work.[88] But PhD physicists who specialize in sectors of engineering physics and applied physics are titled as Technology officer, R&D Engineers and System Engineers.[89]

An example of this is the use of numerical approximations to the Navier–Stokes equations to describe aerodynamic flow over an aircraft, or the use of the finite element method to calculate the stresses in complex components. Second, engineering research employs many semi-empirical methods that are foreign to pure scientific research, one example being the method of parameter variation.[90]

As stated by Fung et al. in the revision to the classic engineering text Foundations of Solid Mechanics:

> Engineering is quite different from science. Scientists try to understand nature. Engineers try to make things that do not exist in nature. Engineers stress innovation and invention. To embody an invention the engineer must put his idea in concrete terms, and design something that people can use. That something can be a complex system, device, a gadget, a material, a method, a computing program, an innovative experiment, a new solution to a problem, or an improvement on what already exists. Since a design has to be realistic and functional, it must have its geometry, dimensions, and characteristics data defined. In the past engineers working on new designs found that they did not have all the required information to make design decisions. Most often, they were limited by insufficient scientific knowledge. Thus they studied mathematics, physics, chemistry, biology and mechanics. Often they had to add to the sciences relevant to their profession. Thus engineering sciences were born.[91]

Although engineering solutions make use of scientific principles, engineers must also take into account safety, efficiency, economy, reliability, and constructability or ease of fabrication as well as the environment, ethical and legal considerations such as patent infringement or liability in the case of failure of the solution.[92]

### Medicine and biology

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A 3 tesla clinical MRI scanner

The study of the human body, albeit from different directions and for different purposes, is an important common link between medicine and some engineering disciplines. Medicine aims to sustain, repair, enhance and even replace functions of the human body, if necessary, through the use of technology.

Genetically engineered mice expressing green fluorescent protein, which glows green under blue light. The central mouse is wild-type.

Modern medicine can replace several of the body's functions through the use of artificial organs and can significantly alter the function of the human body through artificial devices such as, for example, brain implants and pacemakers.[93][94] The fields of bionics and medical bionics are dedicated to the study of synthetic implants pertaining to natural systems.

Conversely, some engineering disciplines view the human body as a biological machine worth studying and are dedicated to emulating many of its functions by replacing biology with technology. This has led to fields such as artificial intelligence, neural networks, fuzzy logic, and robotics. There are also substantial interdisciplinary interactions between engineering and medicine.[95][96]

Both fields provide solutions to real world problems. This often requires moving forward before phenomena are completely understood in a more rigorous scientific sense and therefore experimentation and empirical knowledge is an integral part of both.

Medicine, in part, studies the function of the human body. The human body, as a biological machine, has many functions that can be modeled using engineering methods.[97]

The heart for example functions much like a pump,[98] the skeleton is like a linked structure with levers,[99] the brain produces electrical signals etc.[100] These similarities as well as the increasing importance and application of engineering principles in medicine, led to the development of the field of biomedical engineering that uses concepts developed in both disciplines.

Newly emerging branches of science, such as systems biology, are adapting analytical tools traditionally used for engineering, such as systems modeling and computational analysis, to the description of biological systems.[97]

### Art

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Leonardo da Vinci, seen here in a self-portrait, has been described as the epitome of the artist/engineer.[101] He is also known for his studies on human anatomy and physiology.

There are connections between engineering and art, for example, architecture, landscape architecture and industrial design (even to the extent that these disciplines may sometimes be included in a university's Faculty of Engineering).[102][103][104]

The Art Institute of Chicago, for instance, held an exhibition about the art of NASA's aerospace design.[105] Robert Maillart's bridge design is perceived by some to have been deliberately artistic.[106] At the University of South Florida, an engineering professor, through a grant with the National Science Foundation, has developed a course that connects art and engineering.[102][107]

Among famous historical figures, Leonardo da Vinci is a well-known Renaissance artist and engineer, and a prime example of the nexus between art and engineering.[101][108]

### Business

[edit]

Business engineering deals with the relationship between professional engineering, IT systems, business administration and change management. Engineering management or "Management engineering" is a specialized field of management concerned with engineering practice or the engineering industry sector. The demand for management-focused engineers (or from the opposite perspective, managers with an understanding of engineering), has resulted in the development of specialized engineering management degrees that develop the knowledge and skills needed for these roles. During an engineering management course, students will develop industrial engineering skills, knowledge, and expertise, alongside knowledge of business administration, management techniques, and strategic thinking. Engineers specializing in change management must have in-depth knowledge of the application of industrial and organizational psychology principles and methods. Professional engineers often train as certified management consultants in the very specialized field of management consulting applied to engineering practice or the engineering sector. This work often deals with large scale complex business transformation or business process management initiatives in aerospace and defence, automotive, oil and gas, machinery, pharmaceutical, food and beverage, electrical and electronics, power distribution and generation, utilities and transportation systems. This combination of technical engineering practice, management consulting practice, industry sector knowledge, and change management expertise enables professional engineers who are also qualified as management consultants to lead major business transformation initiatives. These initiatives are typically sponsored by C-level executives.

### Other fields

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In political science, the term engineering has been borrowed for the study of the subjects of social engineering and political engineering, which deal with forming political and social structures using engineering methodology coupled with political science principles. Marketing engineering and financial engineering have similarly borrowed the term.

## See also

[edit]

* Engineering portal

Main article: Outline of engineering

Lists

* List of aerospace engineering topics
* List of basic chemical engineering topics
* List of electrical engineering topics
* List of engineering societies
* List of engineering topics
* List of engineers
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* List of nanoengineering topics
* List of software engineering topics

Glossaries

* Glossary of areas of mathematics
* Glossary of biology
* Glossary of chemistry
* Glossary of engineering
* Glossary of physics

Related subjects

* Controversies over the term Engineer
* Design
* Earthquake engineering
* Engineer
* Engineering economics
* Engineering education
* Engineering education in the United States
* Engineering education research
* Environmental engineering science
* Global Engineering Education
* Green engineering
* Reverse engineering
* Structural failure
* Sustainable engineering
* Women in engineering

## References

[edit]

1. ^ Hammack, William; Anderson, John (February 16, 2022). "Working in the Penumbra of Understanding". Issues in Science and Technology. National Academies of Sciences, Engineering, and Medicine and Arizona State University. Archived from the original on August 3, 2023. Retrieved August 3, 2023. "The method used by engineers to create artifacts and systems—from cellular telephony, computers and smartphones, and GPS to remote controls, airplanes, and biomimetic materials and devices—isn't the same method scientists use in their work. The scientific method has a prescribed process: state a question, observe, state a hypothesis, test, analyze, and interpret. It doesn't know what will be discovered, what truth will be revealed. In contrast, the engineering method aims for a specific goal and cannot be reduced to a set of fixed steps that must be followed."
2. ^ definition of "engineering" from the https://dictionary.cambridge.org/dictionary/english/ Archived February 16, 2021, at the Wayback Machine Cambridge Academic Content Dictionary © Cambridge University
3. ^ "About IAENG". iaeng.org. International Association of Engineers. Archived from the original on January 26, 2021. Retrieved December 17, 2016.
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7. ^ "engineer". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
8. ^ Origin: 1250–1300; ME engin < AF, OF < L ingenium nature, innate quality, esp. mental power, hence a clever invention, equiv. to in- + -genium, equiv. to gen- begetting; Source: Random House Unabridged Dictionary, Random House, Inc. 2006.
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39. ^ Lakwete, Angela (2003). Inventing the Cotton Gin: Machine and Myth in Antebellum America. Baltimore: The Johns Hopkins University Press. pp. 1–6\. ISBN 978-0-8018-7394-2. Archived from the original on April 20, 2021. Retrieved October 13, 2019.
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42. ^ Koetsier, Teun (2001). "On the prehistory of programmable machines: musical automata, looms, calculators". Mechanism and Machine Theory. 36 (5). Elsevier: 589–603\. doi:10.1016/S0094-114X(01)00005-2.
43. ^ Kapur, Ajay; Carnegie, Dale; Murphy, Jim; Long, Jason (2017). "Loudspeakers Optional: A history of non-loudspeaker-based electroacoustic music". Organised Sound. 22 (2). Cambridge University Press: 195–205\. doi:10.1017/S1355771817000103. ISSN 1355-7718. S2CID 143427257.
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46. ^ Taylor, George Rogers (1969). The Transportation Revolution, 1815–1860. M.E. Sharpe. ISBN 978-0-87332-101-3.
47. ^ a b Rosen, William (2012). The Most Powerful Idea in the World: A Story of Steam, Industry and Invention. University of Chicago Press. ISBN 978-0-226-72634-2.
48. ^ Jenkins, Rhys (1936). Links in the History of Engineering and Technology from Tudor Times. Ayer Publishing. p. 66\. ISBN 978-0-8369-2167-0. `{{cite book}}`: ISBN / Date incompatibility (help)
49. ^ Tylecote, R.F. (1992). A History of Metallurgy, Second Edition. London: Maney Publishing, for the Institute of Materials. ISBN 978-0-901462-88-6.
50. ^ a b Hunter, Louis C. (1985). A History of Industrial Power in the United States, 1730–1930, Vol. 2: Steam Power. Charlottesville: University Press of Virginia.
51. ^ Roe, Joseph Wickham (1916). English and American Tool Builders. New Haven, Connecticut: Yale University Press. LCCN 16011753. Archived from the original on January 26, 2021. Retrieved November 10, 2018.
52. ^ Hounshell, David A. (1984). From the American System to Mass Production, 1800–1932: The Development of Manufacturing Technology in the United States. Baltimore, Maryland: Johns Hopkins University Press. ISBN 978-0-8018-2975-8. LCCN 83016269. OCLC 1104810110.
53. ^ Cowan, Ruth Schwartz (1997). A Social History of American Technology. New York: Oxford University Press. p. 138\. ISBN 978-0-19-504605-2.
54. ^ Wheeler, Lynde Phelps (1951). Josiah Willard Gibbs – the History of a Great Mind. Ox Bow Press. ISBN 978-1-881987-11-6. `{{cite book}}`: ISBN / Date incompatibility (help)
55. ^ Williams, Trevor I. (1982). A Short History of Twentieth Century Technology. US: Oxford University Press. p. 3\. ISBN 978-0-19-858159-8.
56. ^ Defonseka, Chris (2020). Polymer Fillers and Stiffening Agents: Applications and Non-traditional Alternatives. Berlin: Walter de Gruyter GmbH & Co KG. p. 31\. ISBN 978-3-11-066999-2.
57. ^ Van Every, Kermit E. (1986). "Aeronautical engineering". Encyclopedia Americana. Vol. 1\. Grolier Incorporated. p. 226.
58. ^ Journal of the British Nuclear Energy Society: Volume 1 British Nuclear Energy Society – 1962 – Snippet view Archived September 21, 2015, at the Wayback Machine Quote: In most universities it should be possible to cover the main branches of engineering, i.e. civil, mechanical, electrical and chemical engineering in this way. More specialized fields of engineering application, of which nuclear power is ...
59. ^ The Engineering Profession by Sir James Hamilton, UK Engineering Council Quote: "The Civilingenior degree encompasses the main branches of engineering civil, mechanical, electrical, chemical." (From the Internet Archive)
60. ^ Indu Ramchandani (2000). Student's Britannica India,7vol.Set. Popular Prakashan. p. 146\. ISBN 978-0-85229-761-2. Archived from the original on December 5, 2013. Retrieved March 23, 2013. "Branches: There are traditionally four primary engineering disciplines: civil, mechanical, electrical and chemical."
61. ^ "Nuclear Engineering Overview" (PDF). Career Cornerstone Center. Archived from the original (PDF) on September 29, 2011. Retrieved August 2, 2011.
62. ^ "faa.gov: "Engineering and Flight Test Designees - Designated Engineering Representative (DER)"". Archived from the original on June 8, 2009. Retrieved May 31, 2009.
63. ^ Lucas, Jim (August 22, 2014). "What is engineering?". Live Science. Archived from the original on July 2, 2019. Retrieved September 15, 2019.
64. ^ "Genrich Altshuller's Theory of Inventive Problem Solving". Theories About Engineering. Archived from the original on September 11, 2019. Retrieved September 15, 2019.
65. ^ "Comparing the Engineering Design Process and the Scientific Method". Science Buddies. Archived from the original on December 16, 2019. Retrieved September 15, 2019.
66. ^ "Forensic Engineering | ASCE". www.asce.org. Archived from the original on April 8, 2020. Retrieved September 15, 2019.
67. ^ Arbe, Katrina (May 7, 2001). "PDM: Not Just for the Big Boys Anymore". ThomasNet. Archived from the original on August 6, 2010. Retrieved December 30, 2006.
68. ^ Arbe, Katrina (May 22, 2003). "The Latest Chapter in CAD Software Evaluation". ThomasNet. Archived from the original on August 6, 2010. Retrieved December 30, 2006.
69. ^ Jowitt, Paul W. (2006). "Engineering Civilisation from the Shadows" (PDF). Archived from the original (PDF) on October 6, 2006.
70. ^ Home page for EMI Archived April 14, 2012, at the Wayback Machine
71. ^ "engineeringuk.com/About_us". Archived from the original on May 30, 2014.
72. ^ George Edwards. "Why Does It Matter? – why are engineering skills important?". Archived from the original on June 19, 2014. Retrieved June 19, 2014.
73. ^ George Edwards. "The ERA Foundation Report". Archived from the original on October 6, 2014. Retrieved June 19, 2014.
74. ^ "Code of Ethics". National Society of Professional Engineers. Archived from the original on February 18, 2020. Retrieved July 12, 2017.
75. ^ "Origin of the Iron Ring concept". Archived from the original on April 30, 2011. Retrieved August 13, 2021.
76. ^ Rosakis, Ares. "Chair's Message, Caltech". Archived from the original on November 4, 2011. Retrieved October 15, 2011.
77. ^ Ryschkewitsch, M.G. NASA Chief Engineer. "Improving the capability to Engineer Complex Systems – Broadening the Conversation on the Art and Science of Systems Engineering" (PDF). p. 8 of 21. Archived from the original (PDF) on August 14, 2013. Retrieved October 15, 2011.
78. ^ American Society for Engineering Education (1970). Engineering education. Vol. 60\. American Society for Engineering Education. p. 467\. Archived from the original on April 16, 2021. Retrieved June 27, 2015. "The great engineer Theodore von Karman once said, "Scientists study the world as it is, engineers create the world that never has been." Today, more than ever, the engineer must create a world that never has been ..."
79. ^ "What is Engineering Science?". esm.psu.edu. Archived from the original on May 16, 2022. Retrieved September 7, 2022.
80. ^ Vincenti, Walter G. (1993). What Engineers Know and How They Know It: Analytical Studies from Aeronautical History. Johns Hopkins University Press. ISBN 978-0-8018-3974-0.
81. ^ Walter G Whitman; August Paul Peck. Whitman-Peck Physics. American Book Company, 1946, p. 06 Archived August 1, 2020, at the Wayback Machine. OCLC 3247002
82. ^ Ateneo de Manila University Press. Philippine Studies, vol. 11, no. 4, 1963. p. 600
83. ^ "Relationship between physics and electrical engineering". Journal of the A.I.E.E. 46 (2): 107–108\. 1927. doi:10.1109/JAIEE.1927.6534988. S2CID 51673339.
84. ^ Puttaswamaiah. Future Of Economic Science Archived October 26, 2018, at the Wayback Machine. Oxford and IBH Publishing, 2008, p. 208.
85. ^ Yoseph Bar-Cohen, Cynthia L. Breazeal. Biologically Inspired Intelligent Robots. SPIE Press, 2003. ISBN 978-0-8194-4872-9. p. 190
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88. ^ Steve Fuller. Knowledge Management Foundations. Routledge, 2012. ISBN 978-1-136-38982-5. p. 92 Archived August 1, 2020, at the Wayback Machine
89. ^ "Industrial Physicists: Primarily specialising in Engineering" (PDF). American Institute for Physics. October 2016. Archived (PDF) from the original on September 6, 2015. Retrieved December 23, 2016.
90. ^ Baofu, Peter (March 26, 2009). The Future of Post-Human Engineering: A Preface to a New Theory of Technology. Cambridge Scholars Publishing. p. 141\. ISBN 978-1-4438-0813-2.
91. ^ Classical and Computational Solid Mechanics, YC Fung and P. Tong. World Scientific. 2001.
92. ^ "Code of Ethics | National Society of Professional Engineers". www.nspe.org. Archived from the original on February 18, 2020. Retrieved September 10, 2019.
93. ^ "Ethical Assessment of Implantable Brain Chips. Ellen M. McGee and G.Q. Maguire, Jr. from Boston University". Archived from the original on April 7, 2016. Retrieved March 30, 2007.
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95. ^ Institute of Medicine and Engineering: Mission statement The mission of the Institute for Medicine and Engineering (IME) is to stimulate fundamental research at the interface between biomedicine and engineering/physical/computational sciences leading to innovative applications in biomedical research and clinical practice. Archived March 17, 2007, at the Wayback Machine
96. ^ "IEEE Engineering in Medicine and Biology: Both general and technical articles on current technologies and methods used in biomedical and clinical engineering ..." Archived from the original on February 13, 2007. Retrieved March 30, 2007.
97. ^ a b Royal Academy of Engineering and Academy of Medical Sciences: Systems Biology: a vision for engineering and medicine in pdf: quote1: Systems Biology is an emerging methodology that has yet to be defined quote2: It applies the concepts of systems engineering to the study of complex biological systems through iteration between computational or mathematical modelling and experimentation. Archived April 10, 2007, at the Wayback Machine
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101. ^ a b Bjerklie, David. "The Art of Renaissance Engineering." MIT's Technology Review Jan./Feb.1998: 54–59. Article explores the concept of the "artist-engineer", an individual who used his artistic talent in engineering. Quote from article: Da Vinci reached the pinnacle of "artist-engineer"-dom, Quote2: "It was Leonardo da Vinci who initiated the most ambitious expansion in the role of artist-engineer, progressing from astute observer to inventor to theoretician." (Bjerklie 58)
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## Further reading

[edit]

* Billington, David P. (1996). The Innovators: The Engineering Pioneers Who Made America Modern (New ed.). Wiley. ISBN 978-0-471-14026-9.
* Blockley, David (2012). Engineering: a very short introduction. New York: Oxford University Press. ISBN 978-0-19-957869-6.
* Dorf, Richard, ed. (2005). The Engineering Handbook (2 ed.). Boca Raton: CRC. ISBN 978-0-8493-1586-2.
* Lord, Charles R. (2000). Guide to Information Sources in Engineering. Libraries Unlimited. ISBN 978-1-56308-699-1.
* Madhavan, Guru (2015). Applied Minds: How Engineers Think. W.W. Norton.
* Petroski, Henry (1992). To Engineer is Human: The Role of Failure in Successful Design. Vintage. ISBN 978-0-679-73416-1.
* Vincenti, Walter G. (1993). What Engineers Know and How They Know It: Analytical Studies from Aeronautical History. The Johns Hopkins University Press. ISBN 978-0-8018-4588-8.

## External links

[edit]

* The dictionary definition of engineering at Wiktionary
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* Otto Neurath
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* Michael Polanyi
* Hans Reichenbach
* Rudolf Carnap
* Karl Popper
* Carl Gustav Hempel
* W. V. O. Quine
* Thomas Kuhn
* Imre Lakatos
* Paul Feyerabend
* Ian Hacking
* Bas van Fraassen
* Larry Laudan

* Category
* Philosophy portal
* Science portal

* v
* t
* e

Glossaries of science and engineering

* Aerospace engineering
* Agriculture
* Archaeology
* Architecture
* Artificial intelligence
* Astronomy
* Biology
* Botany
* Calculus
* Cell biology
* Cellular and molecular biology
* 0–L
* M–Z
* Chemistry
* Civil engineering
* Clinical research
* Computer hardware
* Computer science
* Developmental and reproductive biology
* Ecology
* Economics
* Electrical and electronics engineering
* Engineering
* A–L
* M–Z
* Entomology
* Environmental science
* Genetics and evolutionary biology
* Geography
* A–M
* N–Z
* Arabic toponyms
* Hebrew toponyms
* Western and South Asia
* Geology
* Ichthyology
* Machine vision
* Mathematics
* Mechanical engineering
* Medicine
* Meteorology
* Mycology
* Nanotechnology
* Ornithology
* Physics
* Probability and statistics
* Psychiatry
* Quantum computing
* Robotics
* Scientific naming
* Structural engineering
* Virology

* v
* t
* e

Major industries by economic sector

Primary sector or ′Natural sector′ (raw materials)

| Biotic|

| Agriculture|

* Arable farming
* Cereals
* Legumes
* Vegetables
* Fiber crops
* Oilseeds
* Sugar
* Tobacco
* Permanent crops
* Apples et al.
* Berries
* Citrus
* Stone fruits
* Tropical fruit
* Viticulture
* Cocoa
* Coffee
* Tea
* Nuts
* Olives
* Medicinal plants
* Spices
* Horticulture
* Flowers
* Seeds
* Animal husbandry
* Beef cattle
* Dairy farming
* Fur farming
* Horses
* Other livestock
* Pig
* Wool
* Poultry
* Beekeeping
* Cochineal
* Shellac
* Silk
* Hunting
* Fur trapping

|

Forestry|

* Silviculture
* Bamboo
* Logging
* Firewood
* Rattan
* Tree tapping
* Frankincense
* Gum arabic
* Gutta-percha
* Maple syrup
* Mastic
* Natural rubber
* Palm sugar, syrup, & wine
* Pine resin
* Wild mushrooms
* Fungiculture
* Truffles

Aquatic|

* Fishing
* Anchovies
* Herring
* Sardines
* Cod
* Haddock
* Pollock
* Mackerel
* Shark
* Swordfish
* Tuna
* Crabs
* Lobsters
* Sea urchins
* Squid
* Whaling
* Aquaculture
* Carp
* Catfish
* Tilapia
* Abalone
* Mussels
* Oysters
* Pearls
* Microalgae
* Seaweed
* Both
* Clams
* Sea cucumbers
* Scallops
* Salmon
* Shrimp

Geological|

* Fossil fuels
* Coal
* Peat
* Natural gas
* Oil shale
* Petroleum
* Tar sands
* Mining of ores
* Aluminum
* Copper
* Iron
* Gold
* Silver
* Palladium
* Platinum
* Lithium
* Rare-earth metals
* Uranium
* Other minerals
* Gemstones
* Phosphorus
* Potash
* Salt
* Sulfur
* Quarrying
* Gravel
* Sand
* Chalk
* Clay
* Gypsum
* Limestone
* Dimension stone
* Granite
* Marble

Secondary sector or ′Industrial sector′ (goods manufacturing)

| Manufacturing|

| Light industry|

* Food
* Animal feed
* Baking
* Canning
* Dairy products
* Flour
* Meat
* Prepared
* Preserved
* Sweets
* Vegetable oils
* Beverages
* Beer
* Bottled water
* Liquor
* Soft drinks
* Wine
* Textiles
* Carding
* Dyeing
* Prints
* Spinning
* Weaving
* Carpets
* Lace
* Linens
* Rope
* Clothing
* Accessories
* Dressmaking
* Furs
* Hatmaking
* Sewing
* Shoemaking
* Tailoring
* Printing
* Bookbinding
* Embossing
* Engraving
* Secure
* Typesetting
* Media reproduction
* Cassette tapes
* Phonographs
* Optical discs
* Metal fabrication
* Boilermaking
* Builders' & household hardware
* Cutlery
* Gunsmithing
* Locksmithing
* Machining
* Other smithing
* Powder metallurgy
* Prefabrication
* Surface finishing
* Other fabrication
* 3D printing
* Blow molding
* Drawing
* Extrusion
* Glassblowing
* Injection moulding
* Pottery
* Sintering
* Stonemasonry
* Woodworking
* Furniture
* Other goods
* Baggage
* Bicycles
* Jewellery
* Medical supplies
* Musical instruments
* Office supplies
* Outdoors & sports equipment
* Personal protective equipment
* Toys

|

Electrical
& optical|

* Electronics
* Components
* Circuit boards
* Semiconductors
* Computers
* Computer systems
* Parts & peripherals
* Blank storage media
* Communications equipment
* Mobile phones
* Network infrastructure
* Consumer electronics
* Televisions
* Video game consoles
* Instrumentation
* Clocks and watches
* GPS devices
* Scientific instruments
* Medical imaging systems
* Optical instruments
* Cameras
* Gun & spotting scopes
* Laser construction
* Lens grinding
* Microscopes
* Telescopes
* Electrical equipment
* Batteries
* Electrical & fiber optic cables
* Electric lighting
* Electric motors
* Home appliances
* Transformers

Chemicals|

* Coal & oil refining
* Bitumen
* Coke
* Diesel fuel
* Fuel oil
* Gasoline
* Jet fuel
* Kerosene
* Mineral oil
* Paraffin wax
* Petrochemicals
* Petroleum jelly
* Propane
* Synthetic oil
* Tar
* Commodity chemicals
* Fertilizers
* Industrial gases
* Pigments
* Pure elements
* Speciality chemicals
* Adhesives
* Agrochemicals
* Aroma compounds
* Cleaning products
* Cosmetics
* Explosives
* Fireworks
* Paints & inks
* Perfumes
* Soap
* Toiletries
* Fine chemicals
* Pharmaceuticals
* Antibiotics
* Blood products
* Chemical & hormonal contraceptives
* Generic drugs
* Illegal drugs
* Supplements
* Vaccines

Materials|

* Leather
* Liming & deliming
* Tanning
* Currying & oiling
* Wood
* Drying
* Sawmilling
* Engineered
* Lumber
* Composite
* Paper
* Sizing
* Cardboard
* Pulp
* Tissue
* Rubber
* Tires
* Vulcanized rubber
* Plastics
* Commodity
* Engineered
* Specialty
* Pellets
* Synthetic fibers
* Thermoplastics & thermosets
* Glass
* Borosilicate
* Fused quartz
* Soda-lime
* Float glass
* Glass fiber
* Glass wool & fiberglass
* Safety glass
* Ceramics
* Brick
* Earthenware
* Porcelain
* Refractory
* Tile
* Cement
* Mortar
* Plaster
* Ready-mix concrete
* Other mineral
* Abrasives
* Carbon fibers & advanced materials
* Mineral wool
* Synthetic gems
* Metal refining
* Iron
* Aluminum
* Copper
* Alloys
* Steel
* Formed metal
* Rolled
* Forged
* Cast metal

Heavy industry|

* Machinery
* Conveyors
* Heavy
* Hydraulic
* Machine tools
* Power & wind turbines
* Automobiles
* Other heavy vehicles
* Aerospace & space
* Rail vehicles
* Ships & offshore platforms
* Weapons

Utilities|

* Power
* Electric
* Gas distribution
* Renewable
* Water
* Sewage
* Waste management
* Collection
* Dumping
* Hazardous
* Recycling
* Remediation
* Telecom networks
* Cable TV
* Internet
* Mobile
* Satellite
* Telephone

Construction|

* Buildings
* Commercial
* Industrial
* Residential
* Civil engineering
* Bridges
* Railways
* Roads
* Tunnels
* Canals
* Dams
* Dredging
* Harbors
* Specialty trades
* Cabinetry
* Demolition
* Electrical wiring
* Elevators
* HVAC
* Painting and decorating
* Plumbing
* Site preparation

Tertiary sector or ′Service sector′ (services)

| Sales|

* Retail
* Car dealership
* Consumer goods
* General store
* Grocery store
* Department store
* Mail order
* Online shopping
* Specialty store
* Wholesale
* Auction
* Brokerage
* Distribution

|

Transport
& Storage|

* Cargo
* Air cargo
* Intermodal
* Mail
* Moving company
* Rail
* Trucking
* Passenger transport
* Airlines
* Car rentals
* Passenger rail
* Ridesharing
* Taxis
* Warehousing
* Self storage

Hospitality|

* Foodservice
* Drink service
* Cafés
* Catering
* Fast food
* Food delivery
* Restaurants
* Teahouses
* Hotels

Asset management|

* Financial services
* Banking
* Credit
* Financial advice
* Holding company
* Money transfer
* Payment cards
* Risk management
* Securities
* Insurance
* Health
* Life
* Pension funding
* Property
* Reinsurance
* Real estate
* Brokerage
* Property management

Professional|

* Accounting
* Assurance
* Audit
* Bookkeeping
* Tax advice
* Architecture & engineering
* Inspection
* Surveying
* Physical, product, & system testing
* Design
* Fashion
* Interior
* Product
* Legal services
* Management
* Consulting
* Public relations
* Marketing
* Advertising
* Creative
* Language
* Research and development
* Basic research

Healthcare|

* Medicine
* Dentist offices
* Hospitals
* Nursing
* Residential care
* Veterinary medicine

Entertainment
& leisure|

* Audio-visual
* Film
* Music
* Video games
* Broadcasting
* News
* Radio
* Television
* Sport
* Travel
* Business travel
* Cruise lines
* Tourism
* Gambling
* Online
* Venues
* Arcades
* Amusement parks
* Fairgrounds
* Nightclubs
* Tabletop games

Publishing
& Mass media|

* Written
* Books
* Periodicals
* Software
* Internet
* Hosting
* Social networks
* Streaming
* Websites

Education|

* Primary
* Secondary
* Tertiary
* Vocational school
* University
* Testing
* Tutoring

Other|

* Administrative
* Customer service
* Leasing
* Renting
* Staffing
* Private investigation & security
* Maintenance
* Janitors
* Landscaping
* Repairs
* Personal services
* Beauty
* Dry cleaning
* Funeral
* Maid service
* Pet care
* Sex
* Poverty

Related

| Classification
standards|

* Production-based
* ANZSIC
* ISIC
* NACE
* NAICS
* SIC
* UKSIC
* Market-based
* GICS
* ICB
* TRBC
* Other
* Aftermarket
* Generic
* OEM

|

Inputs
& outputs|

* Externalities
* Community
* Crime
* Culture
* Pollution
* Well-being
* Funding
* Goods
* Commodities
* Final
* Intermediate
* Raw material
* Innovation
* Primary inputs
* Labor
* Natural resources
* Physical capital
* Services
* Technology

Organization|

* Centralization
* Cartel
* Conglomerate
* Horizontal integration
* Mergers and acquisitions
* Monopoly
* Monopsony
* Vertical integration
* Decentralization
* Enforced breakup
* Freelancing
* Homesteading
* Outsourcing
* Putting-out system
* Spinning-off
* Temporary work
* Ownership
* Cooperative
* Joint-stock company
* Nationalization
* Nonprofit organization
* Partnership
* Privatization
* Sole proprietorship
* State-owned enterprise

* Category
* Commons
* Outline

Authority control databases

National|

* Germany
* United States
* France
* BnF data
* Japan
* Latvia
* Korea
* Israel

Other|

* Historical Dictionary of Switzerland
* NARA

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