- Reaffirms who is in control during the forming stage. You.
- Solves the issue
- Sends a strong message to the team that you expect team loyalty and productivnessproductivity
- Will not tolerate negativity for the sake of old allegiances, it is a new day.
I can already envisage a time when I leave the role as I feel the team will be a completely self-managing unit who no longer require a Scrum Master.
Edit in 2021
This answer, whilst highly upvoted, is the answer of a junior Scrum Master on an Agile journey. There is a considerable amount of advice in this answer that I do not agree with any longer and have matured beyond.
The language is unnaturally combative (I had recently left the Armed Forces) and shows a strong misunderstanding of Servant Leadership, even going so far as to use the word Master. It refers to imposing will upon a team which is absolutely not the role of a Project Manager, Delivery Manager, Scrum Master or other equivalent.
Learning to use influence is a sign of business maturity and reflected in the Agile Manifesto.
I have left this answer on Stack Exchange to show that everyone is learning and evolving and we draw upon our experiences. I would not approach a feature team with this attitude any longer and would seek to find a way of working together wherever possible.
However the references and the concept of Disagree and Commit are still strongly encouraged for all.