Kirsten's Cookie a Solution

Kirsten’s Cookie Company

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Review - Operations

Note that in this diagram, activities are arranged in columns to indicate which resources are being used. Inside each activity symbol are written the capacity (in dozens of cookies) and the cycle time (in minutes). 2

Q1.) How long will it take for you to fill a rush order? Assuming this order is for one dozen cookies, we will need to do the following: Activity

Resource

Cycle Time

Start Time

Finish Time

Order Entry

E-mail

0 minutes

00:00

00:00

Wash Bowl, Mix

Self

6 minutes

00:00

06:00

Fill Tray

Self

2 minutes

06:00

08:00

Prepare Oven

Roommate

1 minute

08:00

09:00

Bake

Oven

9 minutes

09:00

18:00

Remove

Roommate

0 minutes

18:00

18:00

Cool

None

5 minutes

18:00

23:00

Pack, Collect Money

Roommate

3 minutes

23:00

26:00 3

Therefore, the minimum time to fill an order is 26 minutes. We can illustrate the sequence of events with a Gantt chart:

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Q2.) How many orders can you fill in a night, assuming you are open four hours each night?

It doesn't take twice as long to produce two batches as it does to produce one batch, because you can start mixing the second batch without having to wait for the whole first-batch process to be completed (you can start washing out the bowl as soon as you finish filling the tray). It is possible to produce two batches in 36 minutes. 5

Q3.)How much of your own and your roommate's valuable time will it take to fill each order?

For yourself: Activity

Cycle Time

Wash Bowl, Mix

6 minutes

Fill Tray

2 minutes

Total

8 minutes

For your roommate: Activity

Cycle Time

Prepare Oven

1 minute

Remove

0 minutes

Pack, Collect Money

3 minutes

Total

4 minutes

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