Nov 20, 2017 9:23 AM
Replying to Sergio Luis Conte
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Take a look to the new version of PMBOK. Everything is better explained there. Beyond great comments above, and trying to add something, let me say.
1-the process group tried to express a "dynamic" that is aligned with PDCA cycle (Plan-Do.Check Act). BUT it does not determine or prescribe a project life cycle.
2-you have to select your own project life cycle to do things and to implement the process you decide to take from the PMBOK. Just is case you use a method (for example a software development method) the project life cycle is embeded into it.
3-if you can take a look to the book "Visualizing project management" or take a look to @Mounir Ajam webpage (Mounir, I do not know if it is alive today) which contains great information about the matter.