Guide to T-Shirt Sizes and Estimation Techniques

Estimation in project management is crucial as it allows the effective use of resources and ensures a smooth project flow.
T-Shirt sizes is one of the common estimation techniques.
Why is it Important?
This technique is known for its simplicity, and allows all team members, even those not experienced in project estimation, to participate in the process. It helps to avoid the bias and provides a higher level of abstraction.
What is it?
It's a simple estimation method that uses sizes XS, S, M, L, XL instead of exact figures or hours. Thus, XS might refer to tasks that take little time/resources, while XL can refer to tasks that would take a lot.
How it works?
Firstly, the team builds a common understanding of the size comparison (XS-SM-M-L-XL); after that, the tasks are divided according to their complexity or effort required using these sizes.
Exam Tips: Answering Questions on T-Shirt Sizes
1. Be familiar with the concept and the aim of the T-shirt sizes estimation technique.
2. Understand that the sizes are equivalent to the effort, complexity and duration of the tasks. For instance, 'XL' task will take longer time and requires more resources than 'S' task.
3. Remember that sizes do not translate directly to a specific number of hours or days. They are relative measures of effort.
4. The question might be framed to check if you know this technique allows less experienced team members to participate in the estimation process.