PMBOK Guide clearly uses the abbreviation of PM only for Project Manager not for Project Management, however we can easily find that many people out there use PM both Project Management and Project Manager. Examples from this web site are followed;
- The PM logo at Projectmanagement.com means Project Management
- PMchallenge and PMwars mean Project Manager
- PM Expertise means Project Management
There is no objection PM is one of the key person in project, but this site or in your presentation material PM are not just only for project manager but maybe all project related members, stakeholders, etc.
So, my suggestion is to use one specific acronym for Project Management, if required; for example like PMT, or just use Project Management like PMBOK Guide.
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Depends on the context. If I say "I hope the PM can get the team to attend the meeting", it's obviously about the Project Manager. If I say "we love the PM profession" it's obviously about Project Management. If I'm in London to visit the queen, or in my home country of Australia and say "I hope this PM makes a difference to the country", I just might be referring to the Prime Minister. Saving Changes...