work organization tool in which project schedules are plotted in a bar chart.

Gantt chart (Wikipedia)

A Gantt chart is a bar chart that illustrates a project schedule. It was designed and popularized by Henry Gantt around the years 1910–1915. Modern Gantt charts also show the dependency relationships between activities and the current schedule status.

A Gantt chart showing three kinds of schedule dependencies (in red) and percent complete indications.
Henry Gantt, inventor of the Gantt chart
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