| Activity | Task(s) of the project that consumes time while people/equipment either work or wait.
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| Activity-on-arrow(AOA) | method for drawing project networks. The activity is shown as an arrow.
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| Activity-on-node(AON) | method for drawing project networks. The activity is on the node (rectangle).
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| Burst activity | An activity that has more than one activity immediately following it.
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| Concurrentengineering | Cross-functional teamwork in new-product development projects that provides product design, quality engineering, and manufacturing process engineering all at the same time.
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| Critical path | The longest activity path(s) through the network. The critical path can be distinguished by identifying the collection of activities that all have the same minimum slack.
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| Gantt chart | A graphic presentation of project activities depicted as a time-scaled bar line (also called a Gantt chart).
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| Hammock activity | A special-purpose, aggregate activity that identifies the use of fixed resources or costs over a segment of the project—e.g., a consultant. Derives its duration from the time span between other activities.
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| Lag relationship | The relationship between the start and/or finish of a project activity and the start and/or finish of another activity. The most common lag relationships are (1) finish-to-start, (2) finish-to-finish, (3) start-to-start, and (4) start-to-finish.
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| Merge activity | An activity that has more than one activity immediately preceding it.
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| Network sensitivity | The likelihood that the critical path will change on a project.
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| Parallel activity | One or more activities that can be carried on concurrently or simultaneously.
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| Slack—total and free | Time an activity can be delayed before it becomes critical.
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