behavior

(1) any sequence of states of a system. (Ashby, Handout, 1961) (2) The behavior of a system is overt and thus manifested in input-output relationships, whereas state trajectories are covert and must either be inferred or must be obtained by "opening the black box". (Michael Arbib)

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A succession of state s (Ashby) starting with the first and ending with the last one observed. The protocol of an observed system 's changes from one state to the next. Whether behavior is merely identified by its name described in terms of a transformation or function , or represented by a generative device, it must ultimately refer to or reproduce a sequence of states or a trajectory in space. (krippendorff )