"Why compose works that have to be re-created every time they are performed? Because definitive, once-and-for-all developments seem no longer appropriate to musical thought as it is today, or to the actual state that we have reached in the evolution of musical technique, which is increasingly concerned with the investigation of a relative world, a permanent 'discovering' rather like the state of 'permanent revolution'."

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Thus if we know a child has had sufficient opportunity to observe and acquire a behavioral sequence, and we know he is physically capable of performing the act but does not do so, then it is reasonable to assume that it is motivation which is lacking. The appropriate countermeasure then involves increasing the subjective value of the desired act relative to any competing response tendencies he might have, rather than having the model senselessly repeat an already redundant sequence of behavior.

— Urie Bronfenbrenner