Sonia,
Good observation. In our efforts to complete a project on time, in scope, and within budget we flex the schedule and process muscle too often. Building into the DNA of a project are supporting processes to ensure people are heard and supported when breakdowns occur.

I would add-on to your first item this: revisit the principles with pulse checks throughout the project. Have a conversation, albeit brief, on how we doing upholding the principals. Where area we falling down? And what do we need to do about it?

I also think the project manager needs to keep a keen eye on personality or approach conflicts and establish an expectation that they need to be addressed. A conversation as to how that should happen is good to have upfront.

Good topic.

Shawn