This chapter proposes: an ontology for the development of tests, the architecture of a test generation module (as a part of a learning management system), and a test generation system (as a separate information system). As an example of the proposed ontology engineering approach to the development of test generation systems we describe an implemented semi-automatic system capable of: designing and generating tests, assisting a user in defining input test parameters (for example a test goal, a scoring schema), explaining the test generation process, and producing test specifications. The system has been tested in two Universities: Aberystwyth (UK), and Vladivostok (Russia).