Agile estimation using T-Shirt Sizing

T-Shirt Sizing Effort Estimation

High level estimates can be provided using the T-Shirt Sizing Estimation technique. It can be used as an alternative to Planning Poker for estimating Story Points for Agile projects. T-Shirt sizing estimates can still be converted into rough number of days and cost involved.

When estimating your backlog, just like Planning Poker, the team can use T-Shirt sizes as shown in the image above. The t-shirt size can be converted into story points as well.

Benefits of T-Shirt Sizing Estimation

  • It is an informal estimation technique and can be used to estimate quickly as it is relative sizing.
  • The primary advantage to t-shirt sizes is the ease of getting started.
  • It is a popular estimation technique used in Agile based software development.
  • It is a good way to introduce the Teams to doing relative estimating.

Mountain Goat Software states,

T-shirt sizes can be a great way of becoming accustomed to relative estimating. So, start with them if your team finds that easier. But minimally put some underlying numbers on them (e.g., Medium=5) and then gradually shift to using the numbers directly.

Have you looked at alternative estimation techniques?

Have a look at the following video for an overview of the estimation strategy that your team can adopt for t-shirt sizing.



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About the Author: Anuj Seth

Anuj is a certified PMP with over 20 years of Software Development and Management experience. He founded PM Tips in 2020. Contributors are welcome. Drop him a note via the Contact page.

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