4 i4 
APPENDIX 
“I wish you to put under every letter in this line (point 
ing to third line) the letter that you see under it up here 
(pointing to first two key lines). Under every ‘b’ put ‘f’ 
and under every ‘1’ put ‘w’ etc. Now, what would you put 
under *r* (pointing to the first letter in the third line)? 
Finish the line. Now take this sheet (giving subject test 
proper) and do the same thing, taking each number as it 
comes. Do this quickly and carefully. All right? Start.” 
Allow 120 seconds. 
Record: Count number of mistakes. Record number of test, 
number of seconds taken, number of letters covered, and 
number of mistakes. E. g., 15; 120 secs., 76 — 2. 
Rating: Apply formula I. Point of reference, 90 in 120 seconds; 
RU, number of units called for by point of reference, i. e., 
90; N, number of units completed; E, errors, which count 
double. Applying the formula to above sample, 
90 
15m. Mixed Letter and Number Substitution 
Description: This test is like 15 except that it is based on the 
following key: 
m k 8 7 d 2 h 
c 4 6 u y 9 t 
F. Clerical Series (general) 
1. Order of Procedure: 
a. 8 
b. 13b or 13c 
c. 15 
d. 10 
e. 12 
2. Shock absorber: Test 8 is simple enough to act as a shock 
absorber and is counted as only 10 per cent of the total 
performance.