(5) When a group of normal young adult subjects, who had a cooperative attitude towards the test, were instructed to work as fast as possible, and another such group were instructed to work at their natural pace, the mean speed of the two groups, in the X part of two alternation tests consisting of "long" units, was practically the same. In the w Test, the mean perseveration score was also the same, but in the Division Signs Test, the mean perseveration score was significantly higher for the group who worked as fast as possible. In an alternation test consisting of "short" units, both the mean perseveration score and the mean speed in the X part, were significantly higher, in the group who worked as fast as possible.

(7) When the score in the w Test, scored as an alternation test, is less than unity, this cannot be regarded as due to a rhythm, which manifests itself in a relatively long pause after the pairs of ws in the Y part, and thus enables recuperation to take place, and the rest of the Y part to be done relatively faster than the X parts. There is some evidence, that it may be due in part to a warming up process, which occurs in both the X₂ and the Y part but which has proportionately more effect in the Y part, because it is twice as long as the X₂ part.

(1) When the w Test is repeated fifty times the score, in the case of the majority of subjects, continues to vary right up to the last trial, whether the test is scored purely as an alternation test, purely as a creative effort test, or as a combination of the two. While the variability is reduced if the mean score for five successive trials, subsequent to the fifteenth, be taken, even this does not give a wholly reliable score.

(4) An alternation test consisting of "short" units gives a much higher perseveration score, on the average, than one consisting of "long" units. Two tests of the former kind have been found to have a fairly high correlation with each other, but the perseveration score in tests of this type correlates highly with speed in the X part, even although they are scored by the "ratio method ".

(3) The score of an alternation test is not a pure measure of the subject's difficulty in alternating the two kinds of unit, of which the test is composed, unless these two kinds of unit are equal in difficulty, or unless a correction has been made for the effect on the score of their inequality in difficulty.

(2) The mean score, obtained in the w Test, for any group of five or more trials, subsequent to the fifth, is largely determined by the form of reversed w used by the subject.

(6) The Division Signs Test correlates significantly with intelligence, as measured by the National Intelligence Test, Scale A, Form 2.

The following conclusions may be regarded as proved: