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 been understood. : Be sure that all the blocks are thoroughly shuffled before the design is presented. The purpose is to eliminate the possibility of studying the design before being ready to begin work with the cubes.

(Section C) If the subject has not understood what is meant, the experimenter may perform trial design (A) slowly, using pantomime freely, the subject watching closely, after which the subject is requested to repeat the operation. This may be repeated any number of times until the subject understands. When he does, proceed with the designs in order, beginning at (Section B), and continuing with (Section D).

(Section D) After the first design has been completed or failed, the blocks are again shuffled, observing the cautions in (Section E), and the subject is told again to "Take these blocks, pick out the right colors, put them together, and make them look on top just like this." (Point to design number 2.) The instructions remain the same for all the designs. The subject is not told at any time the number of the blocks he is to use.

Record.—Both time and moves are recorded. A move is counted when a block is given its initial position on the table. Each separate and distinct change in the position of a block is counted a move. Sometimes a child will make three or four changes in the position of a cube, the topside remaining the same color (especially true of diagonal sides, e.g., red-white). But each change in position is counted a separate move. If success is not attained within the time limit, no credit is assigned. The time limits are indicated on the design cards.

The whole test is not regarded as complete unless there are, ordinarily, at least five consecutive failures on designs after the last success, and where doubt exists as to inability in the later designs, give as many designs beyond the last success as is deemed wise.