A collection of logically-related project activities, usually culminating in the completion of a major deliverable. Project phases (also called phases) are mainly completed sequentially, but can overlap in some project situations. Phases can be subdivided into subphases and then components; this hierarchy, if the project or portions of the project are divided into phasess, is contained in the work breakdown structure. A project phase is a component of a project life cycle. A project phase is not a project management process group.