While an outline of a communication management plan documented as a SOP can be beneficial to keeping the entire company on the same page, I think it is also important to give the project manager leeway. The project manager should know their team best and understand the best ways of communication and frequencies of communication that makes the team thrive. While an outline is great and gives the PM a place to start and prevents communication management plans from being all over the place, taking this outline and tailoring it to the team and project can have many benefits. One part of being a PM is knowing the dynamics of your team and project and what are the best conditions for success. Not allowing flexibility in the communication management plan hinders the PM in doing this.