APPENDIX 
399 
rate into two packs. On this side of the board where you 
see the ‘ O ’ (pointing to left side of a 12" x 12"’cardboard 
with an ‘O’ in the upper left hand corner) put all cards 
which have an ‘ O ’ on them. On the other side, put those 
that do not have an * O Try it with this pack (handing 
subject the sample pack of six cards, three with and three 
without an ‘ O ’). Now do it with this whole pack quickly 
and carefully. Ready? Start.” (Press stop-watch at 
the word ‘start ’ and again when subject is finished.) 
Record: 
Turn cards face down and sort back into original order 
according to numbers on the back of each card, counting 
mistakes in the process. Record as follows: number of 
test, seconds taken, number of mistakes made. For ex 
ample, 2; 35 secs., 2 E. 
Rating: 
Read following section on rating. All tests are rated ac 
cording to one of two formulae. In this one we apply 
formula II. The point of reference is sorting the 50 cards 
in 25 seconds. RU, or the total number of units in the 
test is 50 (cards). Ru, or the reference time per unit is 
.7, i. e., 35 (seconds) -f- 50 (units). 
E, the number of errors, to be counted double. T, the 
time. Applying formula II to the above sample record, 
( Ru X RU — 2 E ) 
T 
= rating, 
•7 X (50 ~ 4) 
35 
= .92 
C. RATING 
Because of the multiplicity of varieties of tests and ways 
of giving them, much confusion has arisen over the methods of 
rating. Some tests are rated according to the amount done in 
a given time; others, according to the time taken to complete 
the entire test others, according to the number of correct and 
false moves; etc., etc. Because of this variety and subsequent