Mr. George Iles in that most interesting and instructive of
books, "Inventors at Work,"[15] has pointed out the importance, to
development in any line of progress or science, of measuring devices
and methods. Contemporaneous with, or previous to, the discovery of
the device or method, must come the discovery or determination of
the most profitable unit of measurement which will, of itself, best
show the variations in efficiency from class. When Dr. Taylor
discovered units of measurement for determining, _prior to
performance_, the amount of any kind of work that a worker could do
and the amount of rest he must have during the performance of that
work, then, and not until then, did management become a science. On
this hangs the science of management.[16]

OUTLINE OF METHOD OF INVESTIGATION.--In the discussion of each
of the nine divisions of Scientific Management, the following topics
must be treated:

1. Definition of the division and its underlying idea.
2. Appearance and importance of the idea in Traditional and
Transitory Management.
3. Appearance and importance of the idea in Scientific
Management.
4. Elements of Scientific Management which show the effects
of the idea.
5. Results of the idea upon work and workers.

These topics will be discussed in such order as the particular
division investigated demands. The psychological significance of the
appearance or non-appearance of the idea, and of the effect of the
idea, will be noted. The results will be summarized at the close of