DERIVED MODEL & HYBRID MODEL

5) Derived model or Customized model – 

we can take any of the above 4 models and change it as per business needs and requirements, that is called as Derived Model.

6) HYBRID MODEL

It combines 2 or more models and modify them as per business requirements.

A) Hybrid model of Spiral and Prototype development models

We go for this model when,

1) Whenever there is dependency, we go for this hybrid model

2) When the customer gives requirement in stages, we develop the product in stages using        this hybrid model.

3) When the customer is new to the s/w domain

4) When developers are new to the domain

5) When customer is not clear about his own requirements

Hybrid model of V&V and Prototype model

We go for this model when,

1) Testing starts from early stages of product development which avoids downward flow of defects, thus reducing re-work.

2) When customer is expecting a very high quality product within stipulated time frame because every stage is tested and developers and testing team work in parallel.

3) When client and developers are both new to the domain

4) When customer is not clear about his own requirements

In this hybrid model, the testing team is involved in testing the prototype.