[1] As the name indicates, the chart deals with the criteria of work elements and their time for both the worker and the machine.
A typical worker-machine activity chart consists of two main columns, one for the worker and the other the machine; in some chart formats, there is a third column showing the cumulative time.
The chart can also be color-coded to convey information; for example, The time column is used to specify the activity of the worker and the machine, if the column is shaded with black color, it indicates that the worker or the machine is performing an operation, while if it is shaded with gray color, it refers to inspection.
For some other uses, there is a same version to accommodate enormous worker-machine interactions, called the multiple worker-multiple machine activity chart.
It can be used to illustrate delays and redundancy, so process improvement efforts can be made to eliminate inefficiencies and identify the activities that can be combined.