Iterative design
The iterative process in design
Producing iterative models
design engineerA person who works on developing concept ideas produced by designers to achieve a functioning product. The design of the functioning product will be based upon scientific and mathematical understanding. typically work through an iterative design A cyclic design process of modelling and testing to achieve gradual improvements to the design. process, starting by producing early models or prototypeThe first working model of a design used for testing, development and evaluation. to test different aspects of their design.
A prototype is an early sample, model, or release of a product built to test a concept or process or to act as something to be replicated or learned from. Early prototypes may be used to test the design’s appearance, functionality or viabilityThe ability to work successfully. for production or as proof of concept (POC)The testing of a product to confirm its potential to function as intended..

Physical prototypes can be made in many materials including papers, boards and foams. Their purpose is to facilitate quick testing, analysis and improvement through iterative changes. James Dyson famously made 5,127 prototypes before he successfully made his concept ready for manufacture.