2 6 EMPLOYMENT PSYCHOLOGY eyes or letting up of the attention is likely to allow some bad shells to slip by or to lengthen the operation. This analysis having been made, the next step was to find tests which would be likely to detect the presence of these qualities. Sixteen different tests were chosen and prepared for preliminary trials. It is not possible or necessary to go into detail on all these tests at this point. However, each test was tried out on a large enough number of girls to give a good indication as to whether it was likely to prove significant. A good deal of time was required for this part of the experiment, but eventu ally a set of eight tests was selected for the body of the experiment. These eight tests will be described later; but before describing them, one or two preliminary prob lems will be of interest. An important question to be settled was the question as to just how these tests should be given. The rooms in which the girls were at work were very noisy, due to con stantly running machines and the handling of thousands of brass shells. Should the girls be tested in this noisy atmosphere or should they be taken off to some quiet place, free from any possible disturbance? In the end it was decided to give the tests in the workroom, on the supposition that if the subjects were left in their regular environment, they would be more likely to show character istic results in their performance in the tests. A girl suddenly taken out of a noisy shop to which she had be come accustomed and into a soundless room might feel just as strange as a girl taken from a quiet place into a very noisy one. A small room was screened off on one side, and this served as a place in which the tests could be given with comparative freedom from intrusion. Some difficulty had been anticipated in putting the