Although this article is independent of the previous one, it would be useful to read the last article first. This article is also part of a book that is currently with the publisher and likely to be released to the market before the summer.
The following discussion is for the planning processes, within a phase. It is based on PMBOK® Guide, but a similar analysis can be used for ISO 21500.
There are processes, one in each knowledge area that focuses on the management of the knowledge area, including all other processes.