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1. Concept Model
Made from quite simple and commonly available materials. It's purpose is to communicate a the basic concept.

2. Industrial Product Design Prototype
It is used to display the "look and feel" of the product, and to elicit customer feedback.

3. Developmental Model
Used for "proof of concept" and also in house or outsourced developmental testing. Further testing is performed on the prototype to develop the design and gather data to optimize the design. It is also used to determine the reliability and functional operation under specified operating conditions. Little if any emphasis is placed on the "look and feel" of the part or assembly.

4. Alpha Prototype
This prototype contains most of the intended features, though it may be scaled in size. It is used primarily for in-house testing and evaluation.

5. Beta Prototype
This prototype contains the full features and scale of the production part or assembly and is used primarily for internal and external evaluation and testing. Beta prototypes are the developed Alpha Prototype.