KRISTEN’S COOKIE COMPANY—OBSERVATIONS
(rev. 9-13-10)
The following is a summary of key points for each question. First, the flow chart.
1.
As noted in the class room lecture, the term “order” is a bit misleading in that an order
could be for any quantity of cookies (from one dozen to multiple dozens). So, when
trying to understand the capacity of a process, it is important to define that capacity, and
the demands made on that capacity, in terms of how of the goods/services are produced.
In this case, production is by the dozen. The total task time for an order of one dozen
cookies is 26 minutes.
Generally, most people come up with this number or something
very close. Every dozen produced will go through all of these steps. If an order called for
two dozen cookies, then the total time from the start of the first dozen until the second
dozen was completed would be 36 minutes (26 minutes for the first dozen with the
second dozen being completed 10 minutes later—the cycle time of the bottleneck and,
therefore, of the process).
2.
This question is usually the most troublesome.
In order to properly understand it, you
must understand the difference between throughput time and cycle time (which is
something that I emphasized during the Lego block simulation because the term
cycle
time
has two quite different meanings—for this course, we will use
cycle time
to mean
the time between the completion of successive units of output and
throughput time
to
mean the time it takes a single unit of output to go through a process from beginning to
end).
If we assume that each order is for one dozen cookies, then it was demonstrated
that we can make 22-23 dozen cookies within exactly four hours (mathematically, 22.4).
This assumes that we have at least two cookie trays (which is a reasonable assumption
since the case states that you and your room mate own “cookie trays”, plural).
If we limit
ourselves to a maximum of four hours of operating time, we get the following:
Wash and
mix
6 min/batch
(1-3 dozen
per batch)
Spoon onto
tray
2 min/tray
(1 doz/tray)
Load oven/set timer
1 min/tray
bake—9 min/tray
total: 10 min/tray
Cool
5 min/tray
Pack
2 min/tray
Payment
1 min/order

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