Scheduling - Operation Management - Lecture Slides, Slides of Production and Operations Management

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Scheduling

Production Planning Process

Process Planning

Strategic Capacity Planning

Aggregate Planning

Master Production Scheduling

Material Requirements Planning

Order Scheduling Weekly Workforce &

Customer Scheduling

Daily Workforce &

Customer Scheduling

Long

Range

Medium

Range

Short

Range

Manufacturing Services

How much & when to produce

How much & when to produce the end item

How much & when to produce component items

Scheduling

 Deals with the timing of operations

 Specifies when resources are needed to

produce a product or provide a service

 Helps us decide what order to perform jobs

 All organizations perform scheduling to

some extent…

In service organizations,

managers schedule…

Nursing staff

Operating room use

Instructor schedules

Classroom use

Sequencing Rules

 Determine the order jobs are processed by

a resource

 Which job should a machine do first, next, etc.?

 Which surgeries should go to the operating room first?  What order should you work on your course projects in?

 Many sequencing rules exist

 Each attempts to achieve to an objective

Objectives in Scheduling

 Meet customer due dates

 Minimize job lateness

 Minimize response time

 Minimize completion time

 Minimize time in the system

 Minimize overtime

 Maximize machine or labor utilization

 Minimize idle time

 Minimize work-in-process inventory

Sequencing Rules (Single Resource)

 Local

 First Come First Served

 Last Come First Served

 Shortest Processing Time

 Longest Processing Time

 Earliest Due Date

 Global

 Slack Per Remaining Operation

 Critical Ratio

- consider only current work center operation

- consider current and all subsequent work

center operations needed to complete job

Sequencing Rules (Single Resource)

 Local

 First Come First Served

 Last Come First Served

 Shortest Processing Time

 Longest Processing Time

 Earliest Due Date

 Global

 Slack Per Remaining Operation

 Critical Ratio

Sequencing Example

This semester you took 5 classes

Each has a major project due at some point in the semester

Projects are assigned during the first week of the semester

What order

do you work

on the

projects?

Processing time:

Time until due:

First Come First Served (FCFS)

What order

do you work on the

projects?

Processing time:

Time until due:

Jobs are processed in order of arrival

Which comes first?

First Come First Served (FCFS)

Processing time: (^9 3 8 2 )

Time until due:

Management Marketing Finance Accounting English

Management Marketing Finance Accounting English

First Come First Served (FCFS)

Processing time: (^9 3 8 2 )

Time until due:

Management Marketing Finance Accounting English

Management Marketing Finance Accounting English

Management Marketing Finance Accounting English

First Come First Served (FCFS)

Processing time: (^9 3 8 2 )

Time until due:

Management Marketing Finance Accounting English

Management Marketing Finance Accounting English

Management Marketing Finance Accounting English

Superimposing due dates…

First Come First Served (FCFS)

Superimposing due dates…

Processing time:

Time until due:

Management Marketing Finance Accounting English

Management Marketing Finance Accounting English

Management Marketing Finance Accounting English

Management Marketing Finance Accounting English

So 3 projects are late!!

How many weeks late?