Kristen and her roommate are in the business of baking custom cookies. As soon a

Question

Kristen and her roommate are in the business of baking custom cookies. As soon as she receives an order by phone, Kristen washes the bowl and mixes dough according to the customer’s order - activities that take a total of 6 minutes. She , then, spoons the dough onto a tray that holds one dozen cookies ( 2 minutes ) . Her roommate, then, takes 1 minute to set the oven and place the tray in it. Cookies are baked in the oven for 9 minutes and allowed to cool outside for 5 minutes. The roommate , then, boxes the cookies ( 2 minutes ) and collects payment from the customer ( 1 minute ) . The case continued - suppose each order consists of two dozen cookies. Assume although the mixing bowl can accommodate dough for two dozen cookies at a tie, the oven can accommodate only one tray of one dozen cookies at a time. As before, spooning each tray takes 2 minutes and both trays must be cooled prior to boxing the cookies for customer pickup. Draw a flowchart and a Gantt chart for this modified process….and determine the theoretical flow time. Consider the effect on flow time of the flowing possible alternatives to the system.

Explanation / Answer

part a) Flowchart is as follows for one dozon cookies:

1) washing the bowl and mixing dough (6 min)

2) spooning the dough onto a tray (2 min )

3) Setting oven and placing cookies in it (1 min)

4) backing of cookies (9 min)

5) cooling (5 min )

6) boxing of cookies (2 min)

7) payment (1 min )

Part b ) For order of 2 dozon cookies and assuming the conditions :            

1) washing the bowl and mixing dough (6 min)

2) spooning the dough onto a tray (2 min )

3) Setting oven and placing cookies in it (1 min)

4) backing of a tray 1 of cookies (9 min )

5) cooling of tray 1 (5 min ) and Setting oven and placing cookies in it for tray 2 (1 min) ( overall 1 min but colling of first tray not finished still required 4 min )

6) backing of a tray 2 of cookies (9 min ) (in this time tray 1 cooled (remaining 4 min) and also packed (2 min))

7) cooling of tray 2 ( 5 min)

8) boxing of cookes for tray 2 (2 min) and

9) payment (1 min )

Total process time = 6+2+1+9+1+9+5+2+1 =36 min

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