You manage all test cases created with CATT, in test catalogs. Test cases are classified as manual or automatic. Manual test cases are used mainly for acceptance tests, and automatic test cases mainly for function tests.

To be able to use the test catalog to generate test plans, you must put it in the SAP Application hierarchy. This puts the test catalog in the SAP environment in which you can create test plans, which may be in several test catalogs. This procedure allows you to create a lot of small test catalogs, which are easier to maintain than one large test catalog.