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Case Study Kristen's Cookie

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Submitted By clemwd
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Case Report: Kristen's Cookie company
1. It takes 26 minutes to complete a rush order, that is, the addition of the time it takes to complete each step: 6 (wash and mix) + 2 (spoon) + 10 (load and bake) + 5 (unload and cool) + 2 (pack) + 1 (pay) = 26.
Process flow diagram of the cookie-making process:
Me
Mixer
Me
Spoon and tray
Roommate
Oven and tray
Oven and tray

INPUT

OUTPUT

Roommate
Oven and tray
Tray
Roommate
Roommate

Remarks: Since it does not consume any time, the first step, that is to take an order, is here ignored. Inventory is not kept at any time as the cookie dough is continuously being processed by the dozen to fit the bottleneck's capacity and only produce fresh cookies according to placed orders.

2. We assume the following: The minimum amount of cookies per order is one dozen cookies (the case states that the process produces “cookies by the dozen”). There are at least two trays and spoons, as the case mentions “cookie trays” and “spoons” Since the amount of time necessary to unload the oven is considered “negligeable”, it can be done during the same minute used to load the next batch.
In this view, the first order takes 26 minutes but each following batch only requires an additional 10 minutes (see Gantt chart 1 attached). Capacity of resources (dozen cookies per hour): | Me | Roommate | Mixer (1) | Trays (2) | Spoons (2) | Oven (1) | Cycle time | 8mns/unit | 4mns/unit | 6mns/3unit = 2mns/unit | 15mns/2units = 7.5mns/unit | 2mns/2units =1mn/unit | 10mns/unit | Capacity | 7.5/hour | 15/hour | 30/hour | 8/hour | 60/hour | 6/hour |

Since 4 hours = 240 minutes, the team can fill up to 22 orders in 236 minutes, that is 26mns+21x10mns.
3. If we assume that valuable time is working time and that each order

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