218 APPLYING EFFICIENCY PBINCIPLES
TABLE 11 (CONCLUDED)
Time available for rest, changing
service cards, handling material
between jobs, etc., by
's standard lees this
table 66 1.81
Per cent, of total time available
for rest, changing service cards,
handling material between jobs,
fNext above) X 100. „ „„
etc. = ;—7—J—J 11. 30.
8 standard
's standard allows ample time for the job
In this case it was desirable to test the severity of
the standards previously set by comparing my own
determinations with the previous ones in a few sample
cases. That this might give reliable results, it was
necessary that my own determinations should be
especially accurate. The main cycle was therefore
analyzed into its elements and a time-motion study
was made. It resulted in a standard time of main
cycle per strip of .849 minutes. As a check on this,
the total time of twenty-one main cycles was observed
separately, and is recorded in the study of Overall
Operation. One of these is a short strip and its time
therefore could not be taken as sufficient. To require
absolutely the shortest or next to shortest time shown
for a full length strip would probably also be too
severe. We might therefore fix on the third best
record for a full length strip, as being a fair standard.
This record is .843 minute; and no one could say, even
after making a time-motion study, that .849 was any
nearer right. Because the time-motion study was
made, one has much more confidence than he could have
had otherwise that a standard of .849 is about right;
but if the only object had been to set a standard time
for this operation, one might better have timed the
