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A client ordered 1,000 2D medical device bags from PlastiPharm. Unfortunately, delivery was delayed by two days, and the client was not pleased. A bottleneck analysis was conducted to determine where the problems were in the process. Target times in all steps of the process were compared to actual times. Interestingly, the analysis showed that the client did not respond to questions for two days (someone was out sick, and no one covered for them). While the two-day delay was explained, PlastiPharm determined that improvements could be made to avoid such a delay in the future and took steps to ensure there would be multiple people in the client organization with whom they could ask questions. The client was satisfied with the analysis results and appreciated the effort. Why was it important for the company to perform a bottleneck analysis and then take action?

  • The bottleneck analysis allowed the company to identify the problem, determine a solution so it would not happen in the future, and maintain client satisfaction.
  • Keeping a client happy is always of highest priority, and the bottleneck analysis helped the company to do that.
  • The bottleneck analysis allowed for the collection of relevant qualitative data that they could show the client and explain the delay.
  • Analyzing where the problem occurred made it possible for the company to demonstrate that it was not to blame.
 
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The Rover 6 is a new custom-designed sports car. An analysis of the task of building the Rover 6 reveals the following list of relevant activities, their immediate predecessors, and their duration:2

a) Draw a network diagram for the project.

b) Mark the critical path and state its length.

c) If the Rover 6 had to be completed 2 days earlier, would it help to:

i) Buy preassembled transmissions and drivetrains?

ii) Install robots to halve engine-building time?

iii) Speed delivery of special accessories by 3 days?

d) How might resources be borrowed from activities on thenoncritical path to speed activities on the critical path?

 
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Kelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table:

a) Determine the expected completion time and variance for each activity.

b) Determine the total project completion time and the critical path for the project.

c) Determine ES, EF, LS, LF, and slack for each activity.

d) What is the probability that Kelle Carpet and Trim willfinish the project in 40 days or less?

 
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Four Squares Productions, a firm hired to coordinate the release of the movie Pirates of the Caribbean: On Stranger Tides (starring Johnny Depp), identified 16 activities to be completed before the release of the film.

a) How many weeks in advance of the film release should Four Squares have started its marketing campaign? What is the critical path? The tasks (in time units of weeks) are as follows:

b) What is the probability of completing the marketing campaign in the time (in weeks) noted in part a?

c) If activities I and J were not necessary, what impact would this have on the critical path and the number of weeks needed to complete the marketing campaign?

 
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