Amsterdam, The Netherlands, 1992. The third is the affective area. The relevant concepts are desires, goals, values. It is this third area that I shall use to illustrate the application of the layering concepts. There, dynamics of agent behaviour is described in terms of attractors.
Attractors are limit sets in a state space.
Local optimal states. The generality issues can also be reflected in the explicitness of representation, i.e. in the existence of explicit variables representing optimality metrics.