PMI-ACP Question #170: Real Exam Question with Answer & Explanation

The correct answer is A: 20. Affinity Estimating is a rapid group estimation technique where team members silently sort user stories into size groups (XS, S, M, L, XL) and then discuss disagreements. For this technique to be effective and worthwhile, the Product Backlog should contain a minimum of 20 items.

Submitted by zhang_li· Apr 18, 2026Adaptive Planning

Question

Affinity Estimating is a technique many teams use to quickly and easily estimate a large number of user stories. What should be the minimum size for the items in the Product Backlog?

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Explanation

Affinity Estimating is a rapid group estimation technique where team members silently sort user stories into size groups (XS, S, M, L, XL) and then discuss disagreements. For this technique to be effective and worthwhile, the Product Backlog should contain a minimum of 20 items. With fewer items, the overhead of setting up the affinity process outweighs the benefit, and the relative sizing comparisons become less meaningful. With 20+ items, the team can quickly establish a size scale and draw meaningful comparisons between stories.

Topics

#Affinity Estimating#Agile Estimation#Product Backlog#User Stories

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