SDLC- Prototype model

In this Prototype Model before designing phase, a prototype is developed, tested, reviewed and approved by the customer, after that design will be ready for coding, testing, installation and maintenance will take place. This prototype is prepared based on the customer requirements. Prototype testing is checking for the required components are present or not.

By using this prototype, customer can understand the requirements of desired system and also the customer can get an “actual feel” of the system. It is an attractive idea for complex and bigger systems.

This Prototype Model is same as waterfall model, but in this model we need to develop prototype and customer interaction will be there. Since there is customer interaction there will be less chance of rejection.

When to use Prototype model:  

• Whenever the customer not clears about the requirement in this situation we generally go for prototype model.
• If it is complex project, then prototype model makes clear understand the requirement.
• Prototyping make sure that the customer constantly works with the system and provide a feedback about the system.

 Advantages of Prototype model:

• Customer satisfaction exists, because customer can feel the product at very early stage.
• If there is missing functionality can be identified easily
• There will be less chance of software rejection.
• Requirement changes are allowed.
• Due to customer approval we can find the errors at early stage.
• Customer involvement will be there in the development where its leads to better solutions for any confusion / complexity / difficult functions
• The developed prototype can be re-used by developer and test engineer.

 Disadvantages of Prototype model:

• There are no parallel deliverables
• It is a time consuming if customer ask for changes in prototype
• This methodology may increase the system complexity as scope of the system may expand beyond original plans.
• The invested effort in the preparation of prototypes may be too much if not properly monitored.
• Customer may get confused in the prototypes and real systems.