A model is an informative representation of an object, person or system. The term originally denoted the plans of a building in late 16th-century English, and derived via French and Italian ultimately from Latin modulus, a measure.[1]

Models can be divided into physical models (e.g. a ship model or a fashion model) and abstract models (e.g. a set of mathematical equations describing the workings of the atmosphere for the purpose of weather forecasting). Abstract or conceptual models are central to philosophy of science.[2][3]


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In scholarly research and applied science, a model should not be confused with a theory: while a model seeks only to represent reality with the purpose of better understanding or predicting the world, a theory is more ambitious in that it claims to be an explanation of reality.[4]

A physical model (most commonly referred to simply as a model but in this context distinguished from a conceptual model) is a smaller or larger physical representation of an object, person or system. The object being modelled may be small (e.g., an atom) or large (e.g., the Solar System) or life-size (e.g., a fashion model displaying clothes for similarly-built potential customers).

The geometry of the model and the object it represents are often similar in the sense that one is a rescaling of the other. However, in many cases the similarity is only approximate or even intentionally distorted. Sometimes the distortion is systematic, e.g., a fixed scale horizontally and a larger fixed scale vertically when modelling topography to enhance a region's mountains.

Instrumented physical models are an effective way of investigating fluid flows for engineering design. Physical models are often coupled with computational fluid dynamics models to optimize the design of equipment and processes. This includes external flow such as around buildings, vehicles, people, or hydraulic structures. Wind tunnel and water tunnel testing is often used for these design efforts. Instrumented physical models can also examine internal flows, for the design of ductwork systems, pollution control equipment, food processing machines, and mixing vessels. Transparent flow models are used in this case to observe the detailed flow phenomenon. These models are scaled in terms of both geometry and important forces, for example, using Froude number or Reynolds number scaling (see Similitude). In the pre-computer era, the UK economy was modelled with the hydraulic model MONIAC, to predict for example the effect of tax rises on employment.

A conceptual model is a theoretical representation of a system, e.g. a set of mathematical equations attempting to describe the workings of the atmosphere for the purpose of weather forecasting.[8] It consists of concepts used to help understand or simulate a subject the model represents.

Abstract or conceptual models are central to philosophy of science,[2][3] as almost every scientific theory effectively embeds some kind of model of the physical or human sphere. In some sense, a physical model "is always the reification of some conceptual model; the conceptual model is conceived ahead as the blueprint of the physical one", which is then constructed as conceived.[9] Thus, the term refers to models that are formed after a conceptualization or generalization process.[2][3]

For example, a street map is a model of the actual streets in a city (mapping), showing the course of the streets while leaving out, say, traffic signs and road markings (reduction), made for pedestrians and vehicle drivers for the purpose of finding one's way in the city (pragmatism).

Additional properties have been proposed, like extension and distortion[11] as well as validity.[12] The American philosopher Michael Weisberg differentiates between concrete and mathematical models and proposes computer simulations (computational models) as their own class of models.[13]

Henry Ford conceived a series of cars between the founding of the company in 1903 and the introduction of the Model T. Ford named his first car the Model A and proceeded through the alphabet up through the Model T. Twenty models in all, not all of which went into production. The production model immediately before the Model T was the Model S,[30] an upgraded version of the company's largest success to that point, the Model N. The follow-up to the Model T was another Ford Model A, rather than the "Model U". The company publicity said this was because the new car was such a departure from the old that Ford wanted to start all over again with the letter A.

The Model T was designed by Childe Harold Wills, and Hungarian immigrants Joseph A. Galamb (main engineer)[20][34] and Eugene Farkas.[35] Henry Love, C. J. Smith, Gus Degner and Peter E. Martin were also part of the team,[36] as were Galamb's fellow Hungarian immigrants Gyula Hartenberger and Kroly Balogh.[20] Production of the Model T began in the third quarter of 1908.[37] Collectors today sometimes classify Model Ts by build years and refer to these as "model years", thus labeling the first Model Ts as 1909 models. This is a retroactive classification scheme; the concept of model years as understood today did not exist at the time. Even though design revisions occurred during the car's two decades of production, the company gave no particular name to any of the revised designs; all of them were called simply "Model T".

Although it was uncommon, the drive bands could fall out of adjustment, allowing the car to creep, particularly when cold, adding another hazard to attempting to start the car: a person cranking the engine could be forced backward while still holding the crank as the car crept forward, although it was nominally in neutral. As the car utilizes a wet clutch, this condition could also occur in cold weather, when the thickened oil prevents the clutch discs from slipping freely. Power reaches the differential through a single universal joint attached to a torque tube which drives the rear axle; some models (typically trucks, but available for cars, as well) could be equipped with an optional two-speed rear Ruckstell axle, shifted by a floor-mounted lever which provides an underdrive gear for easier hill climbing.

Although Ford classified the Model T with a single letter designation throughout its entire life and made no distinction by model years, enough significant changes to the body were made over the production life that the car may be classified into several style generations. The most immediately visible and identifiable changes were in the hood and cowl areas, although many other modifications were made to the vehicle.

The styling on the last "generation" was a preview for the following Model A, but the two models are visually quite different, as the body on the A is much wider and has curved doors as opposed to the flat doors on the T.

Henry Ford's ideological approach to Model T design was one of getting it right and then keeping it the same; he believed the Model T was all the car a person would, or could, ever need. As other companies offered comfort and styling advantages, at competitive prices, the Model T lost market share and became barely profitable.[65] Design changes were not as few as the public perceived, but the idea of an unchanging model was kept intact. Eventually, on May 26, 1927, Ford Motor Company ceased US production[70][71][72] and began the changeovers required to produce the Model A.[73] Some of the other Model T factories in the world continued for a short while,[74] with the final Model T produced at the Cork, Ireland plant in December 1928.[75]

Modelling ("modeling" in American English) is considered to be different from other types of public performance, such as acting or dancing; thus, appearing in a film or a play is not generally considered to be "modelling". Personal opinions are normally not expressed, and a model's reputation and image are considered critical.

Types of modelling include: fashion, glamour, fitness, fine art, and body-part promotional modelling. Models are featured in various media formats, including books, magazines, films, newspapers, the Internet, and television. Fashion modelling is sometimes featured in reality TV shows (America's Next Top Model).

Celebrities, including actors, singers, sports personalities and reality TV stars, frequently participate in modelling contests, assignments, and contracts in addition to their regular work. Modelling often is a part-time activity.

Artist's models pose for any visual artist as part of the creative process. Artist's models are often paid professionals who provide a reference or inspiration for a work of art that includes the human figure. The most common types of art created using models are figure drawing, figure painting, sculpture and photography, but almost any medium may be used. Although commercial motives dominate over aesthetics in illustration, its artwork commonly employs models. Models are most frequently employed for art classes or by informal groups of experienced artists who gather to share the expense of a model.

Modelling as a profession was first established in 1853 by Charles Frederick Worth, the "father of haute couture", when he asked his wife, Marie Vernet Worth, to model the clothes he designed.[2][3] The term "house model" was coined to describe this type of work. Eventually, this became common practice for Parisian fashion houses. There were no standard physical measurement requirements for a model, and most designers would use women of varying sizes to demonstrate variety in their designs.

The modeling profession expanded to photo modeling with the development of fashion photography. Models remained fairly anonymous, and relatively poorly paid, until the late 1940s, when the world's first three supermodels, Barbara Goalen, Bettina Graziani and Lisa Fonssagrives began commanding very large sums. During the 1940s and 1950s, Graziani was the most photographed woman in France and the undisputed queen of couture, while Fonssagrives appeared on over 200 Vogue covers; her name recognition led to the importance of Vogue in shaping the careers of fashion models. One of the most popular models during the 1940s was Jinx Falkenburg, who was paid $25 per hour, a large sum at the time;[4] through the 1950s, Wilhelmina Cooper, Jean Patchett, Dovima, Dorian Leigh, Suzy Parker, Evelyn Tripp and Carmen Dell'Orefice also dominated fashion.[5] Dorothea Church was among the first black models in the industry to gain recognition in Paris. However, these models were unknown outside the fashion community. Wilhelmina Cooper's measurements were 38"-24"-36" whereas Chanel Iman's measurements are 32"-23"-33".[6] In 1946, Ford Models was established by Eileen and Gerard Ford in New York, making it one of the oldest model agencies in the world. ff782bc1db

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