Iterations Are Not Lean
So avoid them – or plan to minimize them. Or fix your methods.
Iterate in Development with a planned Alpha Test and update, then a Beta Test and update, and finally a Pilot Test and update. Iterate there.
But not back to Analysis. Or to Design – unless what you had designed was experimental.
Make sure your Analysis Methods pin down the Performance Requirements and the Performance Context well enough so as to avoid iterations back to Square One.
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