The invention provides, in one aspect, a digital data processor-based test data generator, that includes a digital data processing system with one or more digital data processors that are coupled for communications. A scenario creator executes on the digital data processing system and accepts, for each of one or more entities (“domains”), a plurality of parameters, including a hierarchical relationship between that entity and one or more other entities, a priority-of-test-data-creation relationship between that entity and one or more entities, and one or more attributes of that entity. The scenario creator generates a parameter set that defines a test data set specifying the aforesaid entities, relationships and attributes. The test generator further includes an engine that enumerates values for the entities and their attributes in an order determined by the aforesaid relationships.