Final exam - Chapter 14

Question 1

Scheduling

Answer 1

Scheduling

refers to the assignment of start and completion times to particular jobs, people, or equipment.

Question 2

•Sequencing

Answer 2

•Sequencing

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

Question 3

First come first server

Sequencing or Scheduling

Answer 3

Sequencing

Question 4

Sequencing is used in what sector

Answer 4

service sector

Question 5

What’s a good example that the teacher talked about for sequencing

Answer 5

Walmart line

Question 6

Staff scheduling problem:

Answer 6

Staff scheduling problem:
Given minimum worker requirements for each day of the week, schedule employees so that each has two consecutive days off and all demand requirements are met.

Question 7

Method:

2

Answer 7

Method:

1. Locate the set of at least two consecutive days with the smallest requirements, circle the requirements for these days, & assign a worker to all days not circled.
2. Subtract 1 from the requirement of each day not circled, removing existing circles, and repeat this process until all requirements are satisfied.

Question 8

learn how to do slide 6 in chapter 14

Answer 8

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Question 9

Difference between flow time and make span (test question)

Answer 9

flowtime - how much time it takes to make one unit

Make span - how much time it takes to make one batch

Question 10

Lateness

Answer 10

Lateness is the difference between the completion time and the due date (either positive or negative).

Question 11

Tardiness

Answer 11

Tardiness is the amount of time by which the completion time exceeds the due date. (Tardiness is defined as zero if the job is completed before the due date, and therefore no credit is given for completing a job early).

Question 12

Lateness and tardiness measure

Answer 12

Lateness and tardiness measure performance related to customer-focused due-date criteria.

Question 13

Two of the most popular sequencing rules for prioritizing jobs are:

Answer 13

Two of the most popular sequencing rules for prioritizing jobs are:
Shortest Processing Time (SPT)

Earliest Due Date (EDD)

Question 14

Shortest Processing Time (SPT)

Answer 14

Shortest Processing Time (SPT)
With different processing times, SPT sequencing maximizes resource utilization and minimizes average flow time and WIP inventory.

Question 15

Earliest Due Date (EDD)

Answer 15

Earliest Due Date (EDD)

Earliest Due Date (EDD), minimizes the maximum job tardiness and lateness.

Question 16

Other Sequencing Rule

Answer 16

First come-first served (FCFS).

Question 17

How do we use the shortest processing time?

Answer 17

• Whichever have the shortest processing time you are going to process that first
• you are ignoring due date information
• minimize flowe time and w/i/p

Question 18

What is the problem with the shortest processing time

Answer 18

• the late processing time can be never completed since it takes too much time to process
• a lot of TARDINESS

Question 19

Earliest due date:

Answer 19

you process whatever that is due first

Question 20

what is the problem with the earliest due date

Answer 20

it may block the short processing time products from being processed

Question 21

In a serial manufacturing process, a bottleneck workstation controls the output of the entire process. Thus, it is critical to schedule it efficiently.

Answer 21

1. When processing times are relatively equal, first-come-first-served sequencing works well.
2. With different processing times, SPT sequencing maximizes workstation utilization and minimizes average job flow time.
3. Using Earliest Due Date (EDD), the maximum job tardiness and lateness are minimized.

Question 22

learn slide 12 - 15 (math shit) test question

Answer 22

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Question 23

Two-Resource Sequencing Problem (Johnson’s Rule)

Answer 23

1. List the jobs and their processing times on Resources #1 and #2.
2. Find the job with the shortest processing time (on either resource).
3. If this time corresponds to Resource #1, sequence the job first; if it corresponds to Resource #2, sequence the job last.
4. Repeat steps 2 and 3, using the next-shortest processing time and working inward from both ends of the sequence until all jobs have been scheduled

Question 24

learn slide 17, 18 (math shit) test question

Answer 24

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