120 
EMPLOYMENT PSYCHOLOGY 
ciple. Moreover, it appeared that some of the operators 
had been working at dial machines for periods of from two 
to ten years, while others had been working only a few 
months. Naturally, the old workers would be the better 
operators, even though some of them may not have been 
as promising as some of the newer girls who had not yet 
had much experience. All these factors entered into the 
situation, and still there was a consistent correlation. 
These correlations were high enough to permit the separa 
tion of all operators into two classes, the fast and the slow 
operators, and this classification suggested the basis 
on which applicants could in the future be assigned to 
fast or slow machines. 
That this test distinguished between slow and fast op 
erators was still further borne out by the fact that two of 
the four shops mentioned contained slow operators, who 
did correspondingly slow work in the tests. One shop 
had slow machines while the night shift of the other shop 
had very slow operators. Correspondingly, the average 
performance of the night shift in the test was between 
twenty-five and thirty per cent poorer than that of the 
day shift which was made up of fast workers. 
To check the results still further, the test was given to 
sixteen applicants chosen at random from the employ 
ment office. Only three of the sixteen attained the aver 
age made by the operators in one of the shops, thus tend 
ing to confirm the statement made by the foreman of this 
shop that seven out of every ten girls sent in for this work 
failed to make good. 
Besides the test already described, the Scott three-hole 
test was given. This test consists of a board set at an 
angle of 45° with three holes six inches apart forming an 
equilateral triangle. The task of the subject is to push