Can any one tell me is there any separate BOK for PMI-ACP Certification? or is PMBOK suffice?
AFAIK, there isn't a separate BoK for Agile. You can get more updates on this page:
Let's keep sharing more info on PMI-ACP here as and when we come across something new.
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I confirmed that there's no BoK for PMI-ACP (and there's no plan for one) because that would go against the Agile principles, which are to continuously inspect and adapt instead of following a fixed standard.
Hope that makes sense.
Here's the link to PMI Agile Community of Practice
I saw lot of reference to Agile in PMBOK 5th edition. Even PMI listed lot of reference books related to Agile in PMI-ACP exam web page. I think all of those suffice.