How many management plans on a project?

Now that we have been debating the questions on:

1. Do the PMBOK® Guide process groups repeat or are they project phases? And
2. How many charters are there on a project?

What do you think about the following?
How many management plans are there on a project?

If you think there is only when, when would you develop it?
If you think there are more than one, then what are they? When will you develop them?
I will let these questions open for a few days – to hear your opinion. Then I can offer the approach that we have developed as part of our The Customizable and Adaptable Methodology for Managing Projects™ (CAM²P™).
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