The string diagram
One technique for studying and improving the displacement of workers and materials is the string diagram. See figure 1 in this section. It is a scale plan or model on which a thread is used to trace and measure the path of workers, malerials or equipment during a specified sequence of events. Thus, it is a sort of flow diagram in Now which string or thread is used to measure distance Because of the need to measure, it is necessary that the the string diagram be drawn correctly to scale.
String diagrams start by recording all the relevant facts from direct observation. For this you need to use a very simple study sheet. See example of study sheet in figure 2. To fill the study sheet you need to follow the worker under study as he or she moves from point to point in doing the job. You need to note methodically each point to which the worker moves and, if the journeys are fairly long, the times of arrival and departure as well, li will save a lot of writing if you code the various machines, stores and other points
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