Butterfly Model of Test Development?

Butterfly Model of Test Development:

The Butterfly Model focuses on verification and validation of software products. Butterflies are composed of three  parts: two wings and body. Each part represents a piece of software testing.

The model establishes three general areas of test activities that are illustrated by the butterfly's graphic outline. They are:

• Test Analysis (butterfly's left wing): The left wing of the butterfly represents test analysis – the investigation,  quantization, and/or re-expression of a facet of the software to be tested.

• Test Design (right wing): The right wing of the butterfly represents the act of designing and implementing the test cases needed to verify the design artifact as replicated in the implementation.

• Test Execution (butterfly's body): Test execution includes only the formal running of the designed tests. Informal test execution is a normal part of test design, and in fact is also a normal part of software design and development.