Vinay Aggarwal shares many instances in life where authority is needed and lack of authority allows for extremely costly mistakes. He then explicitly suggests where authority could and should be used in Agile environments.
Agile, as per books does not talk of role of manager but talks of a coach/facilitator. This article first explains the role of project manager in general in any industry and then tries to map it with the role of coach/facilitator in Agile. During this discussion, the article also tries to widen the scope of being a coach/facilitator.
