Terms And Definitions

Figure 3-2 lists terms and definitions of typical CPM schedules. Brief definitions of each are covered with further explanations to follow.

Activities (arrows) Nodes (events) Arrow Diagram

Restraints

Critical Path Early Start {ES}

Late Start (LS)

Early Finish (EF)

Late Finish (LF) Float

Total Float Free Float

Figure 3-2. Terms and Definitions

An item of work, with or without its duration. Start and finish points of an activity. A Network showing a logical sequence of activities and events which are graphically shown as arrows and nodes.

Limiting activities that prevent other activities from starting. They are non-time consuming and are referredto as "dummy" or dependent activities.

The longest duration chain i n a Network.

As implied this is the earliest time that work can begin ona given activity.

The latest time that a given activity can start without affecting the overall project duration.

The finish achieved by starting a given activity at its Early Start and achieving the estimated duration of that activity.

The latest time that an activity can finish without affecting the overall Project Duration.

Spare time available to activities not on the Critical Path.

The amount of spare time available to an activity if all preceding activities are started as early as possible and all following are started as late as possible.

The spare time available to an activity when all activities in the chain are started asearly as possible.

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