Throw away Prototyping

The objective is to understand the system requirements clearly.Starts with poorly understood requirements. Once the requirements are cleared, the system will be developed from the beginning.This model is suitable if the requirements are vague but stable.

1. Important features may have been left out of the prototype to simplify rapid implementation. In fact, it may not be possible to prototype some of the most important parts of the system such as safety-critical functions.
2. An implementation has no legal standing as a contract between customer and contractor.
3. Non-functional requirements such as those concerning reliability, robustness and safety cannot be adequately tested in a prototype implementation.