I am looking for an answer to a problem I have seen but couldn't yet figure out how to solve (on my own).
The situation is similar in most cases: Senior management knows that they have some good ideas and they know that this will be done through project work. The project pipeline is usually overloaded and projects are never going fast enough. Additionally they would rather see someone from the impacted department to manage the project (though not a project manager) and they are constantly mentioning that they think what we do is a bureaucratic overkill. They mostly have very high expectations and do not understand why things take x amount of time when they subjectively think it is such a simple question to answer and carry on.
I read the study from PMI about the "Value of project management" but to be honest I thought not even the conclusion was worth buying the book. It was very general and no news or twist to start a critical or challenging thought.
Does anybody have any (positive) experience or, even better, tools & techniques to convince senior management about the value of our work?

