No system of time study can be looked upon as a success unless it
enables the time observer, after a reasonable amount of study, to
predict with accuracy how long it should take a good man to do almost
any job in the particular trade, or branch of a trade, to which the time
student has been devoting himself. It is true that hardly any two jobs
in a given trade are exactly the same and that if a time student were to
follow the old method of studying and recording the whole time required
to do the various jobs which came under his observation, without
dividing them into their elements, he would make comparatively small
progress in a lifetime, and at best would become a skilful guesser. It
is, however, equally true that all of the work done in a given trade can
be divided into a comparatively small number of elements or units, and
that with proper implements arid methods it is comparatively easy for a
skilled observer to determine the time required by a good man to do any
one of these elementary units.
Having carefully recorded the time for each of these elements, it is a
simple matter to divide each job into its elementary units, and by
adding their times together, to arrive accurately at the total time for
the job. The elements of the art which at first appear most difficult to
investigate are the percentages which should be allowed, under different
conditions, for rest and for accidental or unavoidable delays.
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