T-Shirt Size Estimating

T-Shirt size estimating is a process by which stories are categorized as Small, Medium and Large. XL Stories are deemed too big to fit into an iteration and so need to be de-composed into smaller stories.

Each T-shirt size is assigned a value, in story points, based on the experience of the development team. The intent is that we can count up the story points and establish a value for the velocity of the team.