Information Technology Reference
In-Depth Information
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Consider performing the sampling on Tuesdays, Wednesdays, and Thursdays.
Mondays represent a work week startup challenge from the weekend and
might not portray the sustained work levels accurately. Fridays represent a
workweek closedown for the weekend and might introduce inaccuracies simi-
lar to Mondays.
Consider sampling a couple of times midmorning and midafternoon to get a
good representative day-long work level.
Consider timing the actual start/fi nish of four or fi ve completion certifi cates
in a row once the measurement has started. The average time for complet-
ing certifi cates will be the number that the new computer system data entry
screen must beat.
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CPI also alerts DSA to reenforce the data clerks' understanding that the time-
motion study is to gain measurements for “tuning” the new computer system, not for
evaluating their current job performance. Lacking that reenforcement, the data entry
clerks might view the study as “testing” them to see how much work they can do,
which will completely skew the results.
When DSA does the time-motion study, they fi nd out that the manual comple-
tion certifi cate typing takes from 10 min per certifi cate for experienced data entry
staff to 15 min per certifi cate for inexperienced data entry staff. The testing team
suggested that a fourfold decrease in time per certifi cate is a minimum goal to keep
the data entry staff size fl at for at least the next 2 years because the workload seems
to be doubling each year. Using the DSA time-motion study numbers, the PT-03.0
slowest data entry screen response time for an experienced data entry clerk is 2.5
min per certifi cate. An inexperienced data entry clerk needs to be able to complete
certifi cate entry using the same screen in no more than 3.75 min per certifi cate.
Because all DSA data entry clerks will be “inexperienced” on the new system, the
3.75 min per certifi cate goal is expected fi rst. If the data entry screen is designed for
ease of use, then the more experienced data entry clerk should be able to demon-
strate increased speeds approaching the 2.5 min per certifi cate in less than 2 weeks
of practice. All of these measurements and assumptions need to be documented in
PT-03.0 for execution measurement in the Preliminary construction stage.
13.5 PRELIMINARY CONSTRUCTION STAGE
13.5.1 Static Testing
With the Design stage completed, the Preliminary construction stage is begun. The
development team writes detailed specifi cations and starts coding the application in
the database management screen and process languages. Your testing involvement in
these activities is fairly indirect. You convince the development manager of the value
of static testing both the specifi cations and the code. Of the two, static testing the
code via walkthroughs is the most familiar kind of static testing to the developers.
The requirement continues to be the authority document for this testing. Someone
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