...
Once Test Planning is set up and assignments are made, the local tree of the Test Execution tool shows the appropriate test cycle and the phases/systems/sub-systems and their testcases. These show up for a particular user only if they have a testcase assigned to them anywhere in the tree.
For a tester in the Test Execution module, they will two local tree views. One view is labled My Executions and the other is All Executions.