police courts is sufficient evidence of the intrinsic
worth of the method. It is generally recognized, however, that the
serviceableness of the scale has hitherto been seriously limited, both
by the lack of a sufficiently detailed guide and by a number of
recognized imperfections in the scale itself. The Stanford revision and
extension has been worked out for the purpose of correcting as many as
possible of these imperfections, and it is here presented with a rather
minute description of the method as a whole and of the individual tests.

The aim has been to present the explanations and instructions so clearly
and in such an untechnical form as to make the book of use, not only to
the psychologist, but also to the rank and file of teachers, physicians,
and social workers. More particularly, it is designed as a text for use
in normal schools, colleges, and teachers' reading-circles.

While the use of the intelligence scale for research purposes and for
accurate diagnosis will of necessity always be restricted to those who
have had extensive training in experimental psychology, the author
believes that the time has come when its wider use for more general
purposes should be encouraged.

However, it cannot be too strongly emphasized that no one, whatever his
previous training may have been, can make proper use of the scale unless
he is willing to learn the method of procedure and scoring down to the
minutest detail. A general acquaintance with the nature of the
individual tests is by no means sufficient.

Perhaps the best way to learn the method will be to begin by studying
the book through, in order to gain a general acquaintance with the
tests; then, if possible, to observe a few examinations; and finally to
take up the procedure for detailed study in connection with practice
testing. Twenty or thirty tests, made with constant reference to the
procedure as described in Part II, should be sufficient to prepare the
teacher or physician to make profitable use of the scale.

The Stanford revision of the scale is the result of a number of
investigations, made possible by the cooeperation of the author's
graduate students. Grateful acknowledgment is especially due to
Professor H. G. Childs, Miss Grace Lyman, Dr. George Ordahl, Dr. Louise
Ellison Ordahl, Miss Neva Galbreath, Mr. Wilford Talbert, Mr. J. Harold
Williams, and Mr. Herbert E. Knollin. Without their assistance this book
could not have been written.

STANFO