I have been following Kahane’s Solving Tough Probelms for some time now. And have taken many bits of method U into my own practice.
The best bit about it is in this text – from Zaid Hasan – Connecting to the Source: The U-Process.
‘instead of planning and designing you just start. You take the first stp as quickly as possible. You try something out and then evluate it.
You can get this and other publications on this process from here: http://reospartners.com/publications#83