You need to stop using buffer to manage unplanned work in Scrum

https://medium.com/agilelab/strategies-for-handling-unplanned-work-during-sprint-2f89697509ff

What is buffer space?

Based on this story, During sprint plannings reserve some buffer in a sprint backlog. There are two ways to do this. First, you can plan a virtual backlog item of a certain size that will count towards your velocity. This is going to be your buffer. Each time a new user story or bug enters the sprint, you subtract its size from the buffer item until it reaches zero. From this point, all the new work will be rejected by the team and put to the product backlog. Second, you can simply plan fewer items than the usual sprint velocity. During the sprint, you just absorb new user stories. This difference between average velocity and forecast velocity will act as an implicit buffer.

“Scrum is like your mother-in-law, it points out ALL your faults.” — Ken Schwaber

The basis of the Toyota production system and Lean is the absolute elimination of waste. Don’t Hide the Wastes, Visualize them, and solve the root problem.

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