In design, models are used for a variety of different purposes, including:
Generating ideas
Developing and refining ideas
Visualising an idea in 3D
Evaluating and testing ideas and design issues
Communicating ideas
Solving ergonomic, functional and aesthetic problems
Sketch models are models made quickly from cheap, readily available materials to allow designers to create their initial ideas in 3D.
They can help designers visualise their ideas more clearly than they could with a sketch, to develop their initial ideas and to check aesthetic elements of their initial designs.
These are created when building full scale models is impractical, ie, in architecture, interior design, etc.
Models are created on a smaller, or sometimes larger, scale but all proportions are kept the same.
This allows the designer to see their ideas in a physical form, check appropriate sizes and proportions of parts and to clearly communicate their ideas to their client.
Block models look exactly like the final design on the outside but have no working or moving parts.
These can be used to test ergonomics, aesthetics and for advertising purposes.
CAD models are produced using computer aided design packages and are very realistic and accurate. Changes can be made quickly and easily.
They can be tested in a virtual environment, used with computer aided manufacture and also be used for marketing and promotion.
A prototype is an early model or release of a product built to test a concept or process.
The prototype is made to be as close as possible to the final design, using the same manufacturing methods that would be used for the final product.
Prototyping enables full scale performance testing and allows the designer to identify any last minute problems with the product. It also provides clients with a fully working product.