Prototyping Model

The prototyping model is applied when detailed information related to input and output requirements of the system is not available. In this model, it is assumed that all the requirements may not be known at the start of the development of the system. It is usually used when a system does not exist or in case of a large and complex system where there is no manual process to determine the requirements. This model allows the users to interact and experiment with a working model of the system known as prototype. The prototype gives the user an actual feel of the system.

At any stage, if the user is not satisfied with the prototype, it can be discarded and an entirely new system can be developed. Generally, prototype can be prepared by the approaches listed below.

1. By creating main user interfaces without any substantial coding so that users can get a feel of how the actual system will appear.
2. By abbreviating a version of the system that will perform limited subsets of functions
3. By using system components to illustrate the functions that will be included in the system to be developed

 Using the prototype, the client can get an actual feel of the system. So, this case of model is beneficial in the case when requirements cannot be freezed initially. 

 This prototype is developed based on the currently known requirements. Development of the prototype obviously undergoes design, coding, and testing,  but each of these phases is not done very formally or thoroughly.

By using this prototype, the client can get an actual feel of the system, because the interactions with the prototype can enable the client to better understand the requirements of the desired system.