Waterfall model:

This is the oldest model. It represents sequence of stages; output of one stage becomes input of others.

SPIRAL Model:

This is improved VERSION of waterfall model. Here we have scope to reiterate and go BACK to the earlier stages number of times as project progresses.

Build and fix model:

This is a risky and most unorganized model. In this, developers KEEP writing code until the customer is happy.

Rapid Prototype Model:

In this model, we develop prototype which acts like a final PRODUCT. Once prototype is approved, then the actual development starts.

Incremental Model:

In this model, the product is divided into sections and each section of the product are created and tested separately.

Waterfall model:

This is the oldest model. It represents sequence of stages; output of one stage becomes input of others.

Spiral Model:

This is improved version of waterfall model. Here we have scope to reiterate and go back to the earlier stages number of times as project progresses.

Build and fix model:

This is a risky and most unorganized model. In this, developers keep writing code until the customer is happy.

Rapid Prototype Model:

In this model, we develop prototype which acts like a final product. Once prototype is approved, then the actual development starts.

Incremental Model:

In this model, the product is divided into sections and each section of the product are created and tested separately.