A test script editor that easily can be used by anybody in the development team, including non-programmer business analyst testers. The test script editor enables building maintainable and stable test scripts by simple selecting from a set of accessible actions (a combination of the test object and the associated test method). The accessible actions can be calculated by application state engine by calculating all state transitions of preceding actions and subsequent actions in the script. The test script editor can provide context sensitive navigation help for appending steps at the end of the script, inserting steps within the script, changing existing steps and deleting steps.