Predetermined Motion Time Systems (P.M.T.S.)

P.M.T.S. is a work measurement technique whereby times established for basic human motion (classified according to the nature of the motion and the conditions under which it is made) are used to build up the time for a job at a defined level of performance.

PTMS therefore consists of a list of all motions that a worker can utilise in doing a task, together with time values for these motions at a specified level of performance and in specified circumstances.

GILBRETH had conceived the idea of universal elementary motions which he called therblings, and SEGUR developed a predetermined motion time system based on Gilberth’s therblings which he called Motion Time Analysis (MTA).

Since 1930 a good deal of work has been done in this field, and this has resulted in the appearance of a number of practical systems, three of which are work factor, methods time measurement (MTM) and basic motion time study.

When using these systems to compute the standard time for a job, the operation is first analysed into its component motions, going into much greater detail than is normally done in method study analysis, even when two handed charts are being compiled. The way in which each motion is carried out is visualised, the distance involved is estimated, and the motion is classified according to such factors as the difficulty which making it will entail and in the light of any constraints which may affect it.

These systems can provide various levels of detail. Consistency is ensured, and accuracy with manual systems is greater than that of time study. Such detailed systems are time consuming to apply; in fact later systems forfeit detail for speed of application. They are suitable for use amongst indirect workers and for intermittent work:

The advantages of the above three systems are:

a) Short-run tasks can be work measured.

b) Rating is not necessary.

c) The results obtained are consistent.

d) A reasonable estimate of work content can be obtained before the task is actually carried out.

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