A foreman has determined the expected processing times at a machine for a set of jobs and now wants to sequence them. Given the following information, do the following: ITT Job Time Due Date Job (days) 4.5 6.0 (days) a 10 b 17 5.2 1.6 12 27 2.8 18 19 e f 3.3 a-1. Determine the processing sequence using (1) MST, (2) SPT, (3) EDD, and (4) CR. Rule Sequence a-c-b-e-f-d O MST d-e-f-a-c-b O SPT a-c-b-e-f-d O EDD a-c-b-f-e-d O CR a-2. For each sequence, calculate the average days late, the average flow time, and the average WIP. (Do not round intermediate calculations. Round the final answers to 2 decimal places.) Rule Average lateness Average flow time Average WIP MST & EDD day(s) day(s) jobs day (s) day (s) jobs SPT CR day(s) day(s) jobs b. Which rule is best? SPT has the lowest average flow time & average WIP, but EDD & MST O have the lowest average days late.

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
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A foreman has determined the expected processing times at a machine for a set of jobs and now wants to sequence them. Given the
following information, do the following:
Job Time
Due Date
Job
(days)
(days)
a
4.5
10
6.0
17
5.2
12
d.
1.6
27
e
2.8
18
f
3.3
19
a-1. Determine the processing sequence using (1) MST, (2) SPT, (3) EDD, and (4) CR.
Rule
Sequence
a-с-b-е-f-d
MST
d-e-f-a-c-b
SPT
a-c-b-e-f-d
EDD
a-c-b-f-e-d
O
CR
a-2. For each sequence, calculate the average days late, the average flow time, and the average WIP. (Do not round intermediate
calculations. Round the final answers to 2 decimal places.)
Rule
Average lateness
Average flow time
Average WIP
day (s)
day (5)
MST & EDD
day(s)
jobs
day (s)
jobs
SPT
day (s)
day (s)
jobs
CR
b. Which rule is best?
SPT
O has the lowest average flow time & average WIP, but EDD & MST
have the lowest average days late.
Transcribed Image Text:A foreman has determined the expected processing times at a machine for a set of jobs and now wants to sequence them. Given the following information, do the following: Job Time Due Date Job (days) (days) a 4.5 10 6.0 17 5.2 12 d. 1.6 27 e 2.8 18 f 3.3 19 a-1. Determine the processing sequence using (1) MST, (2) SPT, (3) EDD, and (4) CR. Rule Sequence a-с-b-е-f-d MST d-e-f-a-c-b SPT a-c-b-e-f-d EDD a-c-b-f-e-d O CR a-2. For each sequence, calculate the average days late, the average flow time, and the average WIP. (Do not round intermediate calculations. Round the final answers to 2 decimal places.) Rule Average lateness Average flow time Average WIP day (s) day (5) MST & EDD day(s) jobs day (s) jobs SPT day (s) day (s) jobs CR b. Which rule is best? SPT O has the lowest average flow time & average WIP, but EDD & MST have the lowest average days late.
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