The Scrum Framework itself does not prescribe a single way for the Scrum Teams to estimate their work. However T-shirt sizes can be a great way of becoming accustomed to relative estimating. (XS, S, M, L, XL, XXL, XXXL) The primary advantage to t-shirt sizes is the ease of getting started. I really like this method although there are few more other good sizing methods we can use.
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