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Figure 16: Illustrative moments in situSeveral comments are necessary at this stage. First, it should be noted that case studies are notnormally reported as spanning twenty years, though I would contend that this does not renderthis meaningless, any more than the power of the BBC TV series '7-UP', '14-Up', '21-Up', ... '56-Up' is diminished by its longevity. Indeed , it may well be strengthened by the opportunities foranalysis and learning afforded by engagement over such a long period. Second, the duration ofeach illustrative moment varies, thereby pushing the boundaries of the adoption of the term,'moment'. Again, I would assert that this is acceptable since it is the profundity of the learningthat is in question in each instance not the validity or variability of the conditions under which ittook place. Third, the layering of experience, indicated by the three-dimensional nature of thegraph, enables one to claim the profundity of the learning that I sense occurred in each of thesemoments.164Simon Hughes Ph.D. Thesis (October 2012)