EBK OPERATIONS MANAGEMENT
14th Edition
ISBN: 9781260718447
Author: Stevenson
Publisher: MCG COURSE
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Chapter 16, Problem 6P
The following table contains information concerning four jobs that are awaiting processing at a work center.
Sequence the jobs using (1) FCFS, (2) SPT, (3) EDD, and (4) CR. Assume the list is by order of arrival.
b. For each of the methods in part a, determine (1) the average job flow time, (2) the average tardiness, and (3) the average number of jobs at the work center.
c. Is one method superior to the others? Explain.
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Processing time for eight projects, displayed in the sequence they arrived.
Project
P1
P2
P3
P4
P5
P6
P7
P8
Processing time (hours)
3
1
1
2
9
6
1
1.50
2. Given the projects displayed in table above, if FCFS is used to sequence the jobs, what is the average flow rate of the projects?
Note: Round your answer to 2 decimal places.
3. Given the projects displayed in table above, if FCFS is used to sequence the jobs, what is the average flow time of the projects?
Note: Round your answer to 1 decimal place.
4. Given the projects displayed in table above, if FCFS is used to sequence the jobs, what is the average inventory of the projects?
Note: Use your rounded answers from Parts 2 and 3. Round your answer to 1 decimal place.
5. Given the projects displayed in table above, if SPT is used to sequence the jobs, what is the average flow rate of the projects?
Note: Round your answer to 2 decimal places.
6. Given the projects displayed in table above, if SPT is used to sequence…
The data for five tax analysis jobs waiting to be processed by Martha at T. R. Accounting Service has been collected in the Microsoft Excel Online file below. Open the spreadsheet and perform the required analysis to answer the questions below.
Questions
1. Use the shortest-processing-time (SPT) sequencing rules to sequence the jobs. Compute the flow time, tardiness, and lateness for each job, and the average flow time, average tardiness, and average lateness for all jobs. Use minus sign to enter negative lateness values, if any. Round the average values to two decimal places.
Sequence
Job
Processing Time
Due Date
Flow Time
Lateness
Tardiness
1
2
3
4
5
Average
2. Use the earliest-due-date (EDD) sequencing rules to sequence the jobs. Compute the flow time, tardiness, and lateness for each job, and the average flow time, average tardiness, and average lateness for all jobs. Use minus…
The following jobs are waiting to be processed atJulie Morel’s machine center:
In what sequence would the jobs be ranked according to thefollowing rules: (a) FCFS, (b) EDD, (c) SPT, and (d) LPT?All dates are according to shop calendar days. Today on theplanning calendar is day 130, and none of the jobs have beenstarted or scheduled. Which rule is best?
Chapter 16 Solutions
EBK OPERATIONS MANAGEMENT
Ch. 16 - Why is scheduling fairly simple for repetitive...Ch. 16 - Prob. 2DRQCh. 16 - What are Gantt charts? How are they used in...Ch. 16 - Prob. 4DRQCh. 16 - Briefly describe each of these priority rules: a....Ch. 16 - Why are priority rules needed?Ch. 16 - What problems not generally found in manufacturing...Ch. 16 - Explain forward and backward schedulings and each...Ch. 16 - Prob. 9DRQCh. 16 - Prob. 10DRQ
Ch. 16 - Prob. 11DRQCh. 16 - What general trade-offs are involved in sequencing...Ch. 16 - Prob. 2TSCh. 16 - Prob. 3TSCh. 16 - One approach that can be effective in reducing the...Ch. 16 - Doctors and dentists offices frequently schedule...Ch. 16 - Prob. 3CTECh. 16 - Use the assignment method to determine the best...Ch. 16 - Rework Problem 1, treating the numbers in the...Ch. 16 - Assign trucks to delivery routes so that total...Ch. 16 - Develop an assignment plan that will minimize...Ch. 16 - Use the assignment method to obtain a plan that...Ch. 16 - The following table contains information...Ch. 16 - Using the information presented in the following...Ch. 16 - The following table shows orders to be processed...Ch. 16 - A wholesale grocery distribution center uses a...Ch. 16 - The times required to complete each of eight jobs...Ch. 16 - Prob. 11PCh. 16 - A shoe repair operation uses a two-step sequence...Ch. 16 - The following schedule was prepared by the...Ch. 16 - The production manager must determine the...Ch. 16 - A foreman has determined processing times at a...Ch. 16 - Given the information in the following table,...Ch. 16 - Given the following information on job times and...Ch. 16 - Prob. 18PCh. 16 - The following table contains order-dependent setup...Ch. 16 - The following table contains order-dependent setup...Ch. 16 - Prob. 21PCh. 16 - Given this information on planned and actual...Ch. 16 - Given the following data on inputs and outputs at...Ch. 16 - Determine the minimum number of workers needed,...Ch. 16 - Determine the minimum number of workers needed,...Ch. 16 - Determine the minimum number of workers needed,...Ch. 16 - Prob. 1CQ
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- Given the projects displayed in Table 18.21, if FCFS is used to sequence the jobs, whatis the average flow time of the projects (in hours)?arrow_forwardSequence the following jobs by (a) SPT, (b) DDATE, and(c) SLACK. Calculate mean flow time, mean tardiness, andmaximum tardiness. Which sequencing rule would yourecommend? Why?arrow_forwardCourtney is a programmer receiving requests each week to analyze a large database. Five jobs were on her desk Monday morning, and she must decide in what order to write thecode. Assume that a ll jobs arrived today (day I and hour I) in the order shown below. Courtney has assigned the number of hours required to do the coding as noted. Note that Courtney works an 8-hour day and today is a workday. a) Sequence the jobs according to EDD.b) What is the average completion (flow) time?c) What is the average job lateness?d) What is the average number of jobs in the system?arrow_forward
- Eight jobs have arrived in the following order: Job Processing Time Due Date 1 7 23 2 3 9 3 5 8 4 2 11 5 6 16 6 9 18 7 14 40 8 4 31 Find and compare the performance measures for the following sequencing rules using the Excel Sequencing template. Round your answers to two decimal places. Process in the order they have arrived Flow Time Lateness Tardiness Averagearrow_forwardThe following jobs are waiting to be processed at a small machine center: AU dates are specified as manufacturing planning calendar days.Assume that all jobs arrived on day 210 (yesterday) in the ordershown but are not scheduled to begin until day 211 (today).a) Sequence the jobs according to LPT.b) What is the average completion (flow) time?c) What is the average job la teness?d) What is the average number of jobs in the system?arrow_forwardGiven the jobs displayed in Table 18.17, if SPT is used to sequence the jobs, what is theaverage flow time of jobs in the system?arrow_forward
- The times required to complete each of eight jobs in a two-machine flow shop are shown in the table that follows. Each job must follow the same sequence, beginning with machine A and moving to machine B. TIME (hours) Job Machine A Machine B a 16 5 b 3 13 c 8 7 d 9 6 e 2 14 f 14 4 g 18 14 h 20 11 Find machine B’s idle time For the sequence determined in part a, how much would machine B's idle time be reduced by splitting the last two jobs in half?arrow_forwardAn insurance claims work area has five claims waiting for processing as follows: Job Processing Time Due Date (Di ) 1 18 31 2 14 25 3 12 23 4 19 24 5 10 37 Use the Excel Sequencing template to find the average flowtime, average and maximum tardiness, and average lateness for the following sequences: SPT sequence, EDD sequence, and the sequence 4-3-2-1-5. Round your answers for the average values to two decimal places. The SPT sequence is - - - - . Average Flow Time Average Tardiness Maximum Tardiness Average Lateness The EDD sequence is - - - - . Average Flow Time Average Tardiness Maximum Tardiness Average Lateness 4-3-2-1-5 sequence: Average Flow Time Average Tardiness Maximum Tardiness Average Lateness What sequencing rule do you recommend? The ___________ is recommended as it minimizes average flow time and number of jobs in system.arrow_forwardAssume the jobs displayed in Table 18.22 need to be processed on a single resource andare sequenced with the WSPT rule. What is the average flow rate of the jobs (in jobs perminute)?arrow_forward
- The following six jobs are to be scheduled on a single machine: Job 1 2 3 4 5 6 Processing time (min.) 110 120 220 90 180 80 Suppose the jobs are processed in FCFS numerical order. Compute the makespan, flow time for each job, and overall average flow time. Round your answers to the nearest whole number. Job Flow Time (min) 1 2 3 4 5 6 Makespan: minutes Average flow time: minutes In what order would the jobs be processed using the SPT rule? The SPT sequence is - - - - - . Compute the average flow time after each job is completed. Round your answer to the nearest whole number. Average flow time: minutes Compare this answer with your answer to part a. The minimizes flow time and gets the most work done in the least amount of time.arrow_forwardAn architect has five projects to complete. She estimates that three of the projects willrequire one week to complete and the other two will require three weeks and four weeks.During the time these projects are completed (and assuming no other projects areworked on during this time), what is the architect’s flow rate (projects per week)?arrow_forwardThe following five jobs, along with their processing time and due dates, are given below. Processing Days Due Job Time (days) From Today A 8 12 B 4 9 C 3 6 D 7 7 E 5 20 a. Use the Shortest Processing Time Rule (SPT), determine new sequence and determine the average flow-time for the five jobs b. Use the Earliest Due Date Rule (EDD), determine new sequence, and determine the average tardiness.arrow_forward
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