The TAS must run in the development environment because development and programming knowledge are required for its maintainability

The TAS must be under configuration management, along with the test suite, the testware artefacts and the test environment in which it runs

The TAS must separate the test scripts from the environment in which it runs and from the associated harnesses and artefacts

The TAS must consist of components that can be easily replaced without affecting the overall behavior of the TAS itself