IBM 1130 User Manual page 182

PROGRAMMING AIDS
Documenting Variable Usage
Especially when writing a large program in
FORTRAN, it is difficult to remember the functions
for which the variables have been used. This prob-
lem may arise during testing, particularly when
several programs are being tested at one time.
Again, program revision at a later date can be
Section Subsections
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10 01
difficult, and the problem is intensified if the revi-
'sion is being 'done by someone other than the origi-
nal programmer.
The Variable Summary Sheet is a suggested form
for recording the usage of variables.
The sample shown here is related to PAY01
shown later in this section. Both the variables used
and the type (I, R, D, A) are indicated in the columns
to the left of thy form.