Should You Re-Estimate Unfinished Stories?

As well-intentioned as teams are, it’s really hard to finish absolutely everything by the end of a sprint. A team may have grabbed eight product backlog items (typically user stories), but only finish six or seven of them. The other items are often close to done, but this isn’t horseshoes so close doesn’t count.

But what about the estimates on those unfinished product backlog items? Should they be re-estimated? And should the team get partial credit for the work they did complete? Let’s consider each of these questions, starting with partial credit.
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