Story sizing or 'T-shirt' sizing for user stories in agile software development

XS (Extra Small): A very small, simple task requiring minimal effort. 

S (Small): A relatively small, straightforward task. 

M (Medium): A task with moderate complexity and effort. 

L (Large): A larger, more complex task requiring significant effort. 

XL (Extra Large): A very large, complex task with potentially multiple dependencies. 

XXL (Extra Extra Large): An extremely large, complex task requiring a significant amount of time and effort. 


More info:

https://community.atlassian.com/t5/App-Central-discussions/Agile-estimation-unlocked-mastering-t-shirt-sizes-in-Jira/td-p/2707998

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