what is the difference between prototype model and incremental model ?

Answer 1

A prototype model is complete and ready to be made. An incremental model still has some work to be done to complete it.

Answer 2

A model is a representation of the device which may be the correct size or smaller. It can be made of any materials that look right and although all the parts may be there and it may go through the motions of the design, it normally can't function correctly because it is made of plastic or wood, can't stand heat of combustion or conduct electricity, etc. A prototype is expected to be an exact working duplicate of the design for testing purposes. It should be made of the same materials although it will probably be hand machined rather than stamped, forged, molded, or put through some other manufacturing process. Depending on the industry, there may be prototypes that duplicate function without duplicating appearance - say a new tool that hammers and drills but has a boxy case to hold the gears in place - or it may be visual duplicates for showing to test panels. If the product is to be mass produced, prototypes may be constructed a first version of the assembly line to test if the parts fit together and stampings come out of the dies, etc. - planes and cars used to be made this way. The results are prototypes and can be tested and flown. For many products, computer design programs that allow fitting parts together on the screen reduce the need for prototypes and risks of mistakes.

Answer 3

Incremental Prototyping Model