We Can't Tell Management Our Real Estimates!
Some teams are afraid to tell management their "perfect engineering" estimates for the stories, for fear they will be held to those estimates instead of the loaded ones.
If this is your situation, use perfect engineering in your head, but call the estimates eXtreme Programming Units (XPUs) or something. One project called the estimates Gummi Bears, but it is probably better for the programmers to think in terms of their own perfect time.
Then it is simple enough to say to management: "In each three-week period, each programmer can do one XPU. eXtreme Programming Units are carefully calibrated estimates of difficulty. We'll be measuring our rate of delivering XPUs as we go along, so you'll be able to ...
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