In this component of the test plan the tester gives another view of the entities to be tested by describing them in terms of the features they encompass. Features may be described as distinguishing characteristics of a software component or system. They are closely related to the way we describe software in terms of its functional and quality requirements. Example features relate to performance, reliability, portability, and functionality requirements for the software being tested. Features that will not be tested should be identified and reasons for their exclusion from test should be included. In this component of the test plan references to test design specifications for each feature and each combination of features are identified to establish the associations with actual test cases. The test design specifications, test procedures, and test case specifications appear in other sections of the test plan.