We are in the process of planning our first sprint using scrum poker cards and we were wondering,
why are there missing numbers in scrum poker (i.e. 4,6,...)?
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3@see http://stackoverflow.com/questions/9362286/why-is-the-fibonacci-series-used-in-agile-planning-poker – Dennis Jaamann Oct 02 '13 at 15:29
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It's easier to decide for small stories if it's a 5 or an 8. But for larger stories it does not make sense to choose between a 40 or a 45. In this dimensions your estimations cannot be that precise – boskop Oct 08 '13 at 05:38
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4I'm voting to close this question as off-topic because [project management is now off-topic on Stack Overflow](//meta.stackoverflow.com/questions/343829/is-stack-overflow-an-appropriate-website-to-ask-about-project-management-issues/343841#343841). Ask these questions on [SoftwareEngineering.SE](//softwareengineering.stackexchange.com/) and [ProjectManagement.SE](//pm.stackexchange.com/) instead. (You can also flag for moderator intervention to have this question migrated.) – robinCTS Oct 28 '17 at 03:38
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The sequence of numbers used for prioritizing in Scrum is a Fibonacci sequence. The reason the Fibonacci sequence is that experience shows that the sequence tends to be accurate for the way that people estimate difficulty/level of effort.
Nick Zimmerman
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One commercially available set of Scrum poker cards use a sequence similar to the Fibonacci sequence:
0, ½, 1, 2, 3, 5, 8, 13, 20, 40, 100, and optionally a ? (unsure) and a coffee cup (I need a break)
As for why, it's to emphasise that difficulty does not increase linearly, it usually increases exponentially (hence the approximation of Fibonacci sequence).
Also see this post for other ideas as to the choice of this sequence.
