How many types of Defects?

Basically the defects are classified in to three types:

1.     Missing Defect

2.     Extra Defect

3.     Wrong Defect

·         Missing Defect (Requirement not implemented)

The requirement given by the client was not done. This also is a discrepancy from the specifications, and feature that a specification was not performed. It also may mean that requirement of the client wasn’t noted appropriately.

·         Extra Defect (Added something more than need)

A requirement incorporated into the product that wasn’t given by the end client. This is usually a discrepancy from the specification, but it also may be characteristic requested by the user of the product. Nevertheless, it is supposed a defect because it’s a discrepancy from the existing requirements.

·         Wrong Defect (implemented requirement is not working)

The requirements have been performed falsely. Actually this defect is a discrepancy from the given specification.