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In a project network, a dependency is a link among a project's terminal elements.
The A Guide to the Project Management Body of Knowledge (PMBOK Guide) does not define the term dependency, but refers for this term to a logical relationship, which in turn is defined as dependency between two activities, or between an activity and a milestone.
The Project Management Body of Knowledge (PMBOK) is a set of standard terminology and guidelines (a body of knowledge) for project management. The body of knowledge evolves over time and is presented in A Guide to the Project Management Body of Knowledge (PMBOK Guide), a book whose eighth edition was released in 2025. This document results from work overseen by the Project Management Institute (PMI), which offers the CAPM and PMP certifications.
Much of the PMBOK Guide is unique to project management such as critical path method and work breakdown structure (WBS). The PMBOK Guide also overlaps with general management regarding planning, organising, staffing, executing and controlling the operations of an organisation. Other management disciplines which overlap with the PMBOK Guide include financial forecasting, organisational behaviour, management science, budgeting and other planning methods.