Waterfall Model

Prototype Model

• Client can only preview the system only after the final version of the software is developed because there is no feed back loop.

• Client have a preview of the system from the "quick design" and the prototype developed early at the of the process.

• Developers encounter a freezing requirement where they are not allow to modify the requirements or specification of the previous phase until the next iteration.

• Developers can refine or add requirements and specification to the system after the prototype is built.

• The complexity of an error increases because of the nature of the model; each phase is sequential of the other.

• The complexity of an error is low because the prototype enables the developer to detect any deficiency early at the process.