Motives are necessary in socio-technical models before the model has a chance of being sufficient for use.
Motives are often private and therefore hidden variables in human social systems.
Motives each have their extreme forms such as agreed, revenge, exclusive, knowledge, exclusive use.
To the extent that we can surmise motives, black boxes become grey.
Motives fall into at least these four ancient aspects of social systems: Aesthetics (Beauty) Fairness (Good) Truth (workability), (Science) Usefulness (usability), (Economy)