Answer: true
Explanation: A worker-machine chart is a chart that helps to determine if worker and machine time are used efficiently and also the amount of time lost due to forces beyond one's control and/or set aside for rest and relaxation (downtime). It also determine how many machines the operation can manage, to study the activities of workers involved and are good for identifying working and idle time for workers and machine. From these it can be deduced if worker and machine tasks are conducted effectively.