Thinking about the categorisation (sic) step in the set of PKM processes, Mark Bernstein has the idea of "emergent structure" that I find very useful. When collecting bits of information it often isn't possible to know how best to organise or classify them; that often comes later as you begin to see relationships, connections, linkages that simply weren't apparent before. And that can be because your own ability or preparedness to sense a particular pattern has changed, not because the connections themselves weren't implicit before. That idea of looking to form new patterns is a very powerful one, I think, in terms of how PKMs work in practice. It speaks to the need to actively engage in PKM, and therefore makes it more than simply a way of storing and classifying data or information.