EMPLOYMENT PSYCHOLOGY 
5 2 
service could therefore be estimated, the results were as 
follows: 
Length of Service 
Inspectors recommended by the tests 9.56 weeks 
“ not recommended but hired 1.05 weeks 
In other words, the average term of those who were recom 
mended and hired on the basis of the tests was almost ten 
times as long as the average term of those who were hired 
contrary to the evidence of the tests. This is really a 
striking commentary on the results of these tests in so far 
as they affected the turnover. 
To summarize, individual cases showed that the per 
sonal judgments of the experimenter, foreman, and in 
structors were not nearly so reliable as the evidence of 
the tests. A large number of cases, represented by curves, 
showed that the tests made possible at once a separation 
between piece-workers and day-workers which was quite 
beyond the scope of the ordinary employment methods. 
This graphic representation showed also how the standards 
which made possible the desired distinction between appli 
cants was found. The careful steps by which these tests 
and standards were introduced into the employment 
routine were traced. Finally the concrete results of apply 
ing these tests in the employment office were presented. 
It was found (1) that the verdict of the foreman tended 
to bear out that of the tests; (2) that of a certain group 
studied intensively, ninety-four per cent of the success 
ful workers were above the standard in the tests, and all 
failures were failures also in the tests; (3) that those who 
passed the tests worked almost ten times as long as those 
who did not.