PMI, PMBOOK, PMP and RMP are registered trademarks of the Project Management Institute. The document defines various project management abbreviations used by PMI including RMP for Risk Management Professional certification, PMBOK for the Project Management Body of Knowledge standard, PDU for Professional Development Units used to maintain certification, and CCR for the Continued Certification Requirements program. It also describes the testing methods for PMI certifications, which are primarily Computer Based Testing but may also be Paper Based Testing depending on location.