Observing the span of de-velopmental cycles is only a beginning to such an analysis (and a rough approximation that sets aside consideration of the transformation and change inherent in ongoing practice -see below), for each such cycle has its own trajectory, bench-marks, blueprints, and careers (Stack 1989)
This is just one dimension in which the communities which exhibit legitimate peripheral participation are wildly different from one another. What are the implications of this for "designers" like ourselves? It is also noteworthy to consider the sharp contrast between the difference in cycles established by these communities with the incredibly uniform "cycles" that we have settled upon in traditional schooling.