Question

DataSpan, Inc., automated its plant at the start of the current year and installed a flexible manufacturing system. The company is also evaluating its suppliers and moving toward Lean Production. Many adjustment problems have been encountered, including problems relating to performance measurement. After much study, the company has decided to use the performance measures below, and it has gathered data relating to these measures for the first four months of operations.

	Month
	1		2		3		4
Throughput time (days)	?		?		?		?
Delivery cycle time (days)	?		?		?		?
Manufacturing cycle efficiency (MCE)	?		?		?		?
Percentage of on-time deliveries	82	%	77	%	74	%	71	%
Total sales (units)	2100		2010		1907		1835

Management has asked for your help in computing throughput time, delivery cycle time, and MCE. The following average times have been logged over the last four months:

	Average per Month (in days)
	1		2		3		4
Move time per unit	0.6		0.3		0.4		0.4
Process time per unit	2.3		2.2		2.1		2.0
Wait time per order before start of production	20.0		21.9		26.0		28.0
Queue time per unit	4.7		5.5		6.4		7.4
Inspection time per unit	0.8		1.1		1.1		0.8

Required:

1- Compute the throughput time for each month. Compute the delivery cycle time for each month. Compute the manufacturing cycle efficiency (MCE) for each month.

2. Evaluate the company’s performance over the last four months.

3-a. Refer to the move time, process time, and so forth, given for month 4. Assume that in month 5 the move time, process time, and so forth, are the same as in month 4, except that through the use of Lean Production the company is able to completely eliminate the queue time during production. Compute the new throughput time and MCE.

3-b. Refer to the move time, process time, and so forth, given for month 4. Assume in month 6 that the move time, process time, and so forth, are again the same as in month 4, except that the company is able to completely eliminate both the queue time during production and the inspection time. Compute the new throughput time and MCE.

Answer 1

1-a	Throughput time
		1	2	3	4
	Throughput Time in days
	Process time	2.3	2.2	2.1	2
	Inspection time	0.8	1.1	1.1	0.8
	Move time	0.6	0.3	0.4	0.4
	Queue time	4.7	5.5	6.4	7.4
	Total throughput time	8.4	9.1	10	10.6
1-b	Delivery cycle time for each month
	Wait time	20	21.9	26	28
	Throughput time	8.4	9.1	10	10.6
	Total delivery cycle time	28.4	31	36	38.6
1-c	Manufacturing Cycle efficiency
	Process time/Throughput time	27.4%	24.2%	21.0%	18.9%
		Throughput		Delivery cycle		MCE
	Month 1	8.4	days	28.4	days	27.4%	%
	Month 2	9.1	days	31	days	24.2%	%
	Month 3	10	days	36	days	21.0%	%
	Month 4	10.6	days	38.6	days	18.9%	%

2	The Throughput time measure dispalays	Increasing	trends
	The Delivery cycle time days measure displays	Increasing	trends
	Manufacturing Cycle efficiecy Days measure dispalys	Declining	trends

3-a and 3b
		5	6
	Throughput time in days
	Process time	2	2
	Inspection time	0.8	0
	Move time	0.4	0.4
	Total throughput time	3.2	2.4
	MCE	62.50%	83.33%
		Throughput		MCE
	Month 5	3.2	days	62.50%	%
	Month 6	2.4	days	83.33%	%