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A Gantt chart is a type of bar chart that shows a project schedule. Gantt charts show the start and finish dates of tasks (called the terminal elements and summary elements) of a project. Terminal elements and summary elements make up the work breakdown structure of the project. Some Gantt charts also show the dependency (which is called, precedence network) relationships between activities. Gantt charts can be used to show current schedule status using percentage-finished shadings and a vertical "TODAY" line (also called "TIME NOW" or "DATA DATE"). It is a tool of project management invented by the engineer Henry L. Gantt.