If answer is ambiguous, get S. to explain. If he merely defines the words, say, "Yes, but I want you to tell me the difference between ---- and ----." Credit if three of the four answers are given correctly. (See _The Measurement of Intelligence_, pp. 325-26.) 4. _Enclosed Boxes_ Show S. a small cardboard box, and say, "Listen carefully. You see this box; it has two smaller boxes inside of it, and each one of the smaller boxes contains a little tiny box. How many boxes are there altogether, counting the big one?" Allow one-half minute, record answer, then show second box, saying, "This box has two smaller boxes inside, and each of the smaller boxes contains _two_ tiny boxes. How many altogether?" Similarly for (_c_) and (_d_), using three and three, and four and four. Emphasize slightly the words "three" and "four." Credit if three of the four problems are solved correctly within one-half minute each. Spontaneous corrections are counted as correct. 5. _Six Digits Backwards_ Say "Listen carefully. I am going to read some numbers, and I want you to say them backwards. For example, if I should say 5--1--4, you would say 4--1--5. Do you understand?" Then, "Ready now; listen carefully, and be sure to say the numbers backwards." If S. gives digits forwards repeat instructions. If necessary, give (_b_) and (_c_), repeating each time, "Ready now; listen carefully, and be sure to say the numbers backwards." 4, 7, 1, 9, 5, 2; 5, 8, 3, 2, 9, 4; 7, 5, 2, 6, 3, 8. Credit if one set is repeated backwards without error. 6. _Code_