Put ideas on index cards – one to a card – and then arrange them in differ-ent structures. Again, you can do this in a series of passes, using a differentcriterion each time; this will help you to identify core concepts, structuresand outliers.
It's almost as if they're suggesting putting ideas onto index cards after-the-fact rather than from the start as older manuals would have suggested. This would seem to add a huge amount of work to the process.