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    <p>The Team (Dev/QA in your question, but anyone who's committing to the Team's iteration delivery (designers, documentation writers are some I've seen) comes to a consensus on the size of each story, and the overall size that can fit into the iteration.</p> <p>Scrum Teams generally use a 2-phase planning meeting; discussing prioritized stories with the PO, estimating them (which may reveal inconsistent understanding by Team members and/or the PO) using a non-timebased unit (story points, t-shirt sizes, etc.), and then when an agreement has been reached about what will fit into the iteration, breaking the stories down into tasks, and estimating them in the 2nd phase. (It's permissible to renegotiate the iteration commitment if there is dissonance between the the 1st and 2nd phase estimates.)</p> <p>Hopefully, instead of 'voting' (estimate with the most votes wins), the Team is coming to a common consensus of understanding and effort, so that everyone can commit equally. If it comes down to two next-to-each-other-estimates-on-the-scale-being-used that the Team can't come to a complete consensus on, the larger one wins.</p> <p>There is an inherent conflict-of-interest with the PO participating in the estimation process. If s/he really thinks the Team's estimate is out-of-whack, then perhaps they do not share the same understanding of what's being asked for, and a few minutes should be spent gaining additional clarity.</p> <p>Remember the 3Cs of the User Story 'card' -- Card, Conversation, Confirmation. The Card is a promise of a Conversation between the PO and the Team. The PO absolutely needs to be part of that Conversation (can't have it w/o them!), and the PO and Team need to understand and agree upon the Confirmation (acceptance tests) needed.</p>
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