The five unit code concept spans seven years. The first time the idea appeared in a journal was (way) back in 2007, in a journal from my pre degree foundation course. One of many ideas I parked at the time as I pursued other threads.
Move on seven years and 5uc came to mind again. Here it is in a journal from the summer of 2014.
Quite a cursory sketch, but I had already rediscovered the 2007 journal and putting the two journals together gave me a basic plan of what to do next. As usual, the idea and plan was just a starting point, everything else happens as a response to the discoveries made during the making of an outcome.
I share this as an illustration of the importance of maintaining a good record of enquiry. My journals become particularly important when I am bereft of idea, when they often supply a much needed trigger to move me forward.