152 MEMOIRS NATIONAL ACADEMY OF SCIENCES. [vol.xv, 



Thus in the second and third of the above cases no credit is to be given for time ; but in the first case points are given for 

 time as follows: If, for example in (a), the nine blocks are assembled — 



Within 120 seconds but not within SO seconds, count 1 point (see table). 



Within 80 seconds but not within 50 seconds, count 2 points. 



Within 50 seconds but not within 25 seconds, couunt 3 points. 



Within 25 seconds but not within 10 seconds, count 4 points. 



Within 10 seconds, count 5 points. 

 No matter whether the subject finishes or not, credit is given for the degree of success attained as follows: Count 

 each misplaced or unassembled block as three moves and add the number thus obtained to the number of moves actu- 

 ally made. If the total number of moves thus obtained, in (a), for example, is — 



Not over 9 moves, count 5 points (see table). 

 Over 9 moves but not over 11 moves, count 4 points. 

 Over 11 moves but not over 15 moves, count 3 points. 

 Over 15 moves but not over 25 moves, count 2 points. 

 Over 25 moves but not over 50 moves, count 1 point. 

 Over 50 moves, count point. 



A subject completing the assemblage in 65 seconds, having made 12 actual moves and leaving 3 blocks out of 

 place, will be scored as follows: 3X3=9 (moves for errors) ; 9+12=21 (moves in all). 



This number being less than 25, but not less than 15, 2 points are given for moves. Forty-five seconds being less 

 than 50, but not less than 25, the subject is given 3 points for time. Five points (2+3) are therefore given for part (a). 

 Parts (6), (c), (d), and (e) are scored similarly. The total number of points given for parts (a), (b), (c), (d), and (e) 

 constitutes the raw score for test A. The raw scores for test A may therefore vary from to 50. 



The general plan of scoring time in the remaining sets, B, D, E, K. L, N, P, and T, is similar to that employed 

 in A. Any contingency governing the giving of credit fur time is given above each time schedule. The plan in 

 each case, as in A, is to note in the table the time within which the solution is made and to give credit for the number 

 of points indicated directly above that amount of time. 



Test B. Clock test. — In any of the four parts, (6), (c), (d), or (c), if the subject has made no correct response as 

 the time limit approaches, say, "If you are not sure of the right answer tell now what you think it is and we will 

 go on to the next. " (The object is to preclude the giving of a zero score for default when subject may have right answer 

 in his mind but hesitates.) 



Amend the directions for (c), (d), and (e)as follows: If subject has given a wrong answer considerably within the 

 limit, say, "Are you sure that is right?" If subject answers in the affirmative, count the item wrong and proceed 

 to the next. If he gives the right answer, with no further comments on the part of the examiner, count the 

 item + and take the time to the giving of right answer. 



In any one of the five items, (a), (6), (c), (d), or (e), the response is counted either right or wrong; if wrong 

 give no credit for the items; if right, give credit for time as per table, provided, however, that if subject has been questioned 

 by examiner as noted above, one point in the score for that time is counted off. If, for example, subject gave first an incor- 

 rect answer and upon being questioned, then gave a correct answer to item (c) or (d) or (e) in 25 seconds, this being 

 within 30 seconds, but not within 15 seconds, subject should receive 2 points for time minus 1 point for suggestion — 

 1 point for the item. 



The score for test B consists of the sum of the numbers of points received for parts (a), (6), (c), (d), and (e), and may 

 therefore vary from to 22. 



Test D. Maze test.—Ii, after subject has finished a maze, it appears that a line of the maze has been crossed (not 

 due to awkwardness), examiner should say, "You have crossed a line here" (pointing to the place), "You see, that 

 is not an open space. Begin here and see if you can find a path out without crossing any lines." Start the subject 

 again at a point on his pencil mark just before it crosses the line of the maze. Repeat if necessary and if within the 

 time limit. Note time only when subject has finished without crossing a line. 



Test D will then be scored as follows: If subject, in a limit of 2 minutes, has reached the exit in the maze by a 

 path which does not cross a line, give credit for time as per table. 



Whether subject finishes in the time limit or not, give credit for the degree of success he has attained in the maze 

 as follows: Consult accompanying key maze blank in which are blue arrows. (Not reproduced here. It was practi- 

 cally identical with the key mazes of Fig. L, page 188.) To make any turn or turns indicated by one arrow, the 

 first time, without crossing any of the blue lines cutting off blind alleys, constitutes a "successful step" in the solu- 

 tion. The completion of five successful steps will be noted to constitute a correct solution of each maze. Each step 

 is either successful or unsuccessful. If successful, count 1 point; if not, count points. The score for accomplishment 

 for each maze is, therefore, the number of successful steps; provided, however, that an error of crossing a line (even 

 though correction has been made as above indicated) counts off 1 point. The score for each part (a), (6), (c), or (</), 

 is, then, the sum of the score for time and the score for accomplishment. The total raw score for test D is the surr of 

 the four scores for the parts. The range of this score will be seen to be from to 32. 



Test E. Form board. (Dearborn). — If subject fails to solve the problem in any part, (a), (6), (c), or (d), within the 

 time limit, score the part zero. If, however, a correct solution has been accomplished within the time limit, give 

 credit for time and for moves as shown in the table. Thus if (a) is solved in the time limit of 120 seconds, but not 



