Why are there missing numbers in scrum poker (i.e. 4,6,...)? [closed]

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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,...)?

Answer 1

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.

Answer 2

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.