The model according to Ted Williams (2000) is "multi-level, spanning conceptual, generic and applications layers.
The generic and applications layers all also stratified and composed of micro theories spanning, for example, activities, time, resources, constraints, etc.
[4] At the turn of the millennium TOVE has been used to model a computer manufacturer and an aerospace engineering firm.
The TOVE enterprise models is presented by Fox et al. (1995) as second generation knowledge engineering approach.
A first generation knowledge engineering approach "is extracting rules from experts, while second generation is ontology engineering: They develop comprehensive ontologies for all the aspects of an organization they find necessary (necessity is decided based on competency requirements to the model, i.e., what are the questions the model will have to answer, either by ordinary look-up or by deduction).