As long as customer isn’t interested in throughput or customer trusts the team, whatever way you size or estimate doesn’t really matter. But that doesn’t happen very often. Whenever customer questions about team throughput, it becomes challenging to answer using hour-based estimation as time taken to complete any particular task deflates over time.
Some teams follow capacity based estimation technique where they identify the number of hours available in a team for the entire sprint duration. Based on that they pick up stories in a sprint. Again here as well, there is absolutely no way to know any change in team throughput as size for which capacity is defined isn’t defined.
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