EMPLOYMENT PSYCHOLOGY
5 6.00
5.72,
1922
1925
wa Fev., wear nr. 1923 1924 1925
fe Jl -
Figure 32: Proportion of accidents Figure 33: Proportion of accidents
per mile driven for first four months per mile driven for the first four
of 1923, 1924, and 1025. months of the vear.
Data from the Yellow Cab Company, Chicago Illinois (170). Psychological
 tests of applicants for positions as driver were installed in January,
1925. The improved method of selection brought about a substantial
decrease in accidents per mile driven. The exact figures are not given on
the scale. Relative position only is indicated.
tation of such findings are given in Figures 32, 33, and 34.
Vigilance is the price of exact measurement in vocational
selection. It is not enough that a carefully planned investigation
 is carried out by a trained man and that valid and
economical measuring instruments for selection are produced
and put to use. To assure to both workers and management
 the benefits of such scientific procedures, continued
oversight by a competent industrial psychologist is essential.
This volume has outlined the scientific methods which
investigators, in touch with the practical demands of modern
business and industry, have at their disposal for increasing
the reliability of prediction of an applicant’s future competence
 and satisfaction in his work.
Few will question that substantial improvements in the
process of vocational adjustment which these scientific procedures
 make possible are of both economic and social im-220