Page:Kohs-Block-Design tests-1920.pdf/6

 obtained through the use of the Binet Scale, as also upon the basis of the diagnostic value of each design determined by the progress of its curve with increasing chronological age. The results at present indicate that the block designs are as good as any single test in the Binet scale (though better in the sense of diagnostic value), as good as the Trabue Language Completion Tests, or any other similar single type test, whether involving the use of language or whether mere performance.

The designs, appropriately colored, are printed on medium thick, white, semi-gloss cardboard. The dimensions of the card are 3 by 4 inches. The printed designs, placed in the center of the card, are one fourth the size of the actual designs when the cubes are used. In other words, the face of a cube represented on the designs is only one half of an inch on each of its sides. Thus design no. 1 is one inch square, design no. 10 is one and a half inches square, and design no. 14 is two inches square.

The writer has found it of assistance to place in the lower right-hand corner the time limit for each design. These values follow:

The time limit as set for each design is about one minute longer than the time within which a correct response may reasonably be expected.

It may be of interest to remark that if the full limit is allowed on each test the working-time totals only 45 minutes for all of the seventeen designs. With practice an examination should average about thirty to forty minutes. In some