Exam 14: Operations Scheduling and Sequencing

A requirement of Johnson's two-resource sequencing rule is

The SPT sequencing rule will maximize the average flow time.

Which of the following is not a consideration when designing an appointment system?

A print shop has five large commercial printing jobs to finish. They are trying to decide whether to use the shortest processing time SPT) or the first-come first-served (FCFS) sequencing rule. Data on estimated processing time in hours) and time to promised completion in (hours) is as follows jobs shown in (order of arrival): Job Processing time Thme to promised completion A 4 8 B 9 30 C 5 17 D 8 8 E 11 12 a. What is the average flow time in hours using the FCFS rule? b. What is the average job lateness in hours using the FCFS rule? c. What is the average flow time in hours using the SPT rule? d. What is the average job lateness in hours using the SPT rule?

Scheduling applies to all aspects of the value chain.

If the highest priority is to minimize the average job lateness, then the jobs sequence should begin with those jobs requiring

A young entrepreneur has just opened an electronics store. One of the many tasks that she must address is work scheduling. She plans to stay open from 9a.m. to 9 p.m. Monday through Saturday. She expects her employees to stock the shelves and also be available for cashier check-out when needed. All employees are full time and work four days in a row with two consecutive days off each week. She estimates the number of employees needed each day as follows: $\frac { \text { Mon } } { 6 } \quad \frac { \text { Tue } } { 9 } \quad \frac { \text { Wed } } { 5 } \quad \frac { \text { Thu } } { 7 } \quad \frac { \text { Fri } } { 9 } \quad \frac { \text { Sat } } { 10 } \quad \frac { \text { Total } } { 46 }$ a. Use the days-off scheduling procedure to determine the minimum number of employees required? b. Based on your schedule found in part a), which days are overstaffed and by how many workers are they overstaffed?

An airplane repair facility has a contract to repair cargo aircraft for a regional airline. There are 62 planes in the airline company's fleet of planes. Because of the punishing workload, the planes require a considerable amount of maintenance. The repair facility is trying to determine how to schedule the needed repairs. They want to compare the shortest processing time rule and the first-come first-served rule. Currently, the following planes need repair and are in the repair facility data given is in order of plane arrival, only one plane is worked on at a time and the shop is open (24 hours a day, 7 days a week). Plane Estimated repar tine A342 4 hours B554 26 hours C222 2 hours D876 16 hours E211 9 hours F887 6 hours a. In what order should the planes be repaired using the shortest processing time rule use( first letter of plane)? b. What is the average time in (hours) in the shop using the shortest processing time rule? c. What is the average time in (hours) in the shop using the first?come first-served rule?

At the end of each month, a research and development team writes status reports for the projects worked on during the month. The team leaders, Andrew and Julie, submit the reports to the R&D director on the first Monday of each month. It is late Friday evening and to their surprise, they have discovered that the month ends on Sunday and the reports are due on Monday morning. They have decided to come to work early Saturday morning, so they can finish the reports before Monday morning. They split the work as follows: Andrew will write and edit the reports while Julie collates data and draws all the necessary graphs. Assume that Julie starts her work on a report as soon as Andrew is finished with it and that Andrew works continuously. Times for the reports in hours) are as follows: Projects Andrew Julie A 4 2 B 3 5 C 5 1 D 7 3 E 8 6 a. What is the order of the projects using Johnson's rule? b. How many hours will it take them to finish all the reports? c. How many hours is Andrew idle? d. How many hours is Julie idle?

The numerical difference between the completion time and the due date is called

Johnson's sequencing rule is used to sequence

Differentiate between scheduling and sequencing.

UPS, the world's largest package delivery company, is highly dependent on scheduling but not sequencing.

Staff scheduling needs all of the following except

Scheduling refers to determining the order in which jobs or tasks are processed.

Scheduling and sequencing methods used in manufacturing are more beneficial in low-contact, than high-contact, service processes.

Rescheduling rarely occurs unless customers change their requested due dates.

ScheduleAnywhere.com on-line software helps clients do all the following except

Staff scheduling attempts to match available personnel with the needs of the organization by performing what four steps?

The Shortest Processing Time SPT) rule