At the beginning of the life cycle of a project comes the very early phase in which the project has been assigned, and typically, a project management team leader has been determined. Once a single person has been determined to be the project management team leader, it is often up to that project management team leader to choose the remainder of the project management team and assign each of them particular roles. The actual content of those roles will be defined and determined via the utilization of the position description. This position description typically will be drafted before the project management team leader actually begins the process of recruiting for team members to fill these positions, however, in many cases the position description is actually a fluid entity. In fact, often times, when the individual team members are recruited, the position description is tweaked or tailored to take into account some specific positive attributes and skills that each of these individual team members may in fact bring to the table.
This term is defined in the 3rd edition of the PMBOK but not in the 4th.