Lean and spiral

I was doing some research on my class in risk management and I happened upon a post by Bernie Thompson on Barry Boehm's spiral model that had a new twist [no pun intended].

Thompson shows us this diagram:

 It's a take off on agile, lean, Deming's PDCA, and Boehm's spiral. 

You enter the spiral from the top left and go clockwise.

Obviously, you have to pass by the customer after every test....presumably this really means pass by the customer after every tested object is ready for customer application, evaluation, or go-live.

In any event, this diagram nicely captures the agile of idea of customer envolvement and a somewhat evolutionary outcome.

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