While the gradual selection of girls was going on other changes were
also being made.

One of the dangers to be guarded against, when the pay of the man or
woman is made in any way to depend on the quantity of the work done, is
that in the effort to increase the quantity the quality is apt to
deteriorate.

It is necessary in almost all cases, therefore, to take definite steps
to insure against any falling off in quality before moving in any way
towards an increase in quantity.

In the work of these particular girls quality was the very essence. They
were engaged in picking out all defective balls.

The first step, therefore, was to make it impossible for them to slight
their work without being, found out. This was accomplished through what
is known as over-inspection, Each one of four of the most trust-worthy
girls was given each day a lot of balls to inspect which had been
examined the day before by one of the regular inspectors; the number
identifying the lot to be over-inspected having been changed by the
foreman so that none of the over-inspectors knew whose work they were
examining. In addition to this one of the lots inspected by the four
over-inspectors was examined on the following day by the chief
inspector, selected on account of her especial accuracy and integrity.

An effective expedient was adopted for checking the honesty and accuracy
of the over-inspection. Every two or three days a lot of balls was
especially prepared by the foreman, who counted out a definite number of