YDS: Why Was Estimation Replaced by Sizing in Scrum Guide 2020?
Scrum.org
JANUARY 12, 2023
Scrum Guide 2020 replaced the word "estimation" with "sizing" to include different practices teams use to plan their work. Estimation can mean different things, such as story points or time-based estimates, which can limit and create the illusion that story points are an essential part of Scrum. Sizing, on the other hand, refers to the size of a product backlog item and allows for more flexibility in terms of practices, such as counting cards or using flow-based metrics.
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