Terms

User need

The top level requirements that define the intended use or purpose.

Requirement

System and software requirements. System requirements refine the user needs, while the software requirements can be split into smaller parts.

Change request

A documented specification of a change to be made to the software.

Test case

A test case is a specification of the inputs, execution conditions, testing procedures and the expected results. The test case is executed to achieve compliance with a specific requirement.