an element of work performed during the course of a project. An activity normally has an expected duration, an expected cost, and expected resource requirements. Activities are often subdivided into tasks.

the maximum amount of time that an activity can be delayed due to lack of resources.

see arrow diagramming method.

see precedence diagramming method.

a priority value that is assigned to activities to provide an ordering for activities that are waiting for resources (during resource-constrained scheduling).

The act of dividing activities into segments during resource allocation. In some cases, preemption of activity segments can free a resource to be used by a more critical activity.

total costs incurred (direct and indirect) in accomplishing work during a given time period. See also earned value.

the calendar date when work on an activity actually ended. The AF date must be prior to the timenow date.

the calendar date when work on an activity actually began. The AS date must be prior to the timenow date.

the use of activity resource requirements to calculate total resource needs rather than to constrain the project schedule. Normally, resource requirements are used to perform resource-constrained scheduling.

an identification of the type of constraint that is associated with a target date. The following types are available:

the graphic representation of an activity. See also arrow diagramming method.

a network diagramming technique in which activities are represented by arrows. The tail of the arrow represents the start of the activity, and the head represents the finish of the activity (the length of the arrow does not represent the expected duration of the activity). Activities are connected at points called nodes (usually drawn as small circles) to illustrate the sequence in which the activities are expected to be performed. See also precedence diagramming method.

see timenow date.