The Project Management Body of Knowledge (PMBOK(R)) is an inclusive term that describes the sum of knowledge within the profession of project management. The PMBOK(R) Guide identifies and describes the subset of principles and practices within the PMBOK(R) that are generally accepted and applicable to most projects most of the time. The guide also provides a common lexicon for talking about project management. Project management is a relatively young profession, and while there is substantial commonality around what is done, there is relatively little commonality in the terms used. An extensive glossary further aids in standardizing definitions of the most important concepts, terms, and phrases.