I hope most PMs understand that a PMP or PRINCE2 is only a piece of the puzzle. A good PM may or may not have one. However, when it comes to hiring, just like a college degree, it says something about commitment to the profession and a desire to understand best practices. I know great PMs without certification. I know great ones with certification. When I am hiring, I will weight certification as a positive, but not as the whole picture.
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