T-shirt sizing has become a popular method for estimating in agile projects. So, In this video, I answer the question, what is T-shirt Sizing?
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T-shirt sizing is a simple and popular way to estimate the relative scales of different pieces of work. The method is usually used in agile projects and applied to User Stories.
The estimates are rough and ready, and give a first indication of the scale of work. They are less precise than full estimates or even other agile approaches, like Planning Poker, for example.
Typically, we assign a T-shirt size to each item of work. Different users have different sizes, but a common approach might use sizes:
In general, the more different sizes you use, the more variation you will get in how people interpret the terms. So, S, M, and L are the core sizes and you would be wise to resist the temptation to add too many more.
It is good practice to work through a few ‘type’ examples first, which you can use to establish a consensus of what, say, S, M, and L look like.
There are different ways that teams can interpret the sizes.
But they often use Fibonacci numbers in the same way as Planning Poker, so, perhaps, in units of work:
Maybe the team will relate them to the number of iterations, or sprints, they will need, to develop the functionality:
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What is T-shirt Sizing? | Video Click To TweetDr Mike Clayton is one of the most successful and in-demand project management trainers in the UK. He is author of 14 best-selling books, including four about project management. He is also a prolific blogger and contributor to ProjectManager.com and Project, the journal of the Association for Project Management. Between 1990 and 2002, Mike was a successful project manager, leading large project teams and delivering complex projects. In 2016, Mike launched OnlinePMCourses.
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