eft to inference and to the
idiosyncrasy of individual interpretation. The formulation, moreover,
of useful principles cannot be satisfactorily established by the
more-or-less random selection of matters, however important,
pertaining to the subject at hand. What is required is a systematic
analysis of the essentials of the subject, with resultant emphasis on
the fundamental causes and effects whose relationships are to be
expressed.

Formulation and Use of Principles. The formulation of a principle,
referred to previously (page 24) as itself a difficult problem,
requires a citation of the factors pertaining to the subject. On the
basis of these factors as causes, the principles, when properly
formulated, also state the effects which may properly be expected.
(See page 22.)

The relationship between causes and effects, or between effects and
their causes, may be expressed in various ways. The requirement is
that the expression be one of fact and that, if the principle purport
to cover the entire subject, all of the pertinent facts (page 24) be
stated, though not necessarily all the details involved.

* * * * *

In addition to the principles of general application (Chapter III),
the later discussion herein includes numerous other principles, with
reference to matters of detail (pages 22-23). To some of these
principles the treatment invites special attention. All principles
included have been phrased with due care, to ensure conformity with
the requirements above stated. The preferred form, herein, for the
usual statement of cause and effect is through the use of phraseology
such as that certain effects "depend on" or are "dependent on" certain
causes, or that certain causes "determine" certain effects, or that
the latter "are determined by" certain causes.

From the standpoint of the exercise of judgment, it is a principle
that the due determination of effects to be produced depends on the
proper consideration of pertinent factors. Once the principles
applicable to any subject have been formulated in necessary detail,
the evaluation of the cited factors with respect to a particular
situation becomes the vital procedure as to any problem where that
subject is involved. In the course of this evaluation, corollary or
subordinate principles may be of assistance (page 22). In military
problems, however, the evaluation usually involves many factors not
susceptible of reasonably exact dete