By Henry Gantt

Henry L. Gantt, 1916

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In his 1919 book “Organizing for Work” Gantt gives two principles for his charts:

One, measure activities by the amount of time needed to complete them;

Two, the space on the chart can be used to represent the amount of the activity that should have been done in that time.

Gantt shows a progress chart that indicates for each month of the year, using a thin horizontal line, the number of items produced during that month. In addition, a thick horizontal line indicates the number of items produced during the year. Each row in the chart corresponds to an order for parts from a specific contractor, and each row indicates the starting month and ending month of the deliveries. It is the closest thing to the Gantt charts typically used today in scheduling systems, though it is at a higher level than machine scheduling.

Gantt’s machine record chart and man record chart are quite similar, though they show both the actual working time for each day and the cumulative working time for a week. Each row of the chart corresponds to an individual machine or operator. These charts do not indicate which tasks were to be done, however.


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