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Can the ScrumMaster become an impediment?

A ScrumMaster as one of the most important roles in the scrum process. He is the advocator of Scrum inside the organization. He ensures smooth functioning of the team by eradicating impediments and keeping the team shielded from external distractions. Bur can it be that the Scrum Master becomes the biggest impediment?

On InfoQ an interesting summary is written collecting a lot of posts around the possible failure of the ScrumMaster role. I especially think that the multiple hats most Scrum Masters have to wear make it very difficult to do their job well. Can you think of some reasons why being a ScrumMaster can be hard or even impossible?

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