Operations Managements Chapter 14 Operations Scheduling and Sequencing

What is scheduling in relation to operations management?
the assignment of start and completion times to particular jobs, people, or equipment
Define dynamic scheduling
Moving target more mathematical


Define Forward scheduling
Scheduling people as soon as possible

Advising appointments

Define backwards scheduling
Targeting a dealing, basing schedule so you do not break the deadline

As late as possible

Define Static Scheduling
building schedule before you work, managers tell employees they work
What is sequencing in relations to operations management?
Determining the order in which jobs or tasks are processed

determine how well the resource is used to achieve and objective

What are three categories for measuring sequencing performance criteria?
Processed focused performance criteria, information about the start and end time of jobs and focus on shop performance such as equipmrnt utilization and WIP inventory
What is flow time?
amount of time a job spent in the shop or factory
What is make span?
the time needed to process a given set of jobs

Shorter the make span the higher the efficiency means jobs are getting out quickly

What are customer-focused due date criteria in relation to scheduling and sequencing?
Related to customers required due dates or internally determined shipping dates


Difference between completion time and due date


Among of time the completion time exceeds the due date

ZERO means before he due date

What are the two most popular sequencing rules for prioritizing job within a company?
Shortest Processing Time (SPT)

Earliest Due Date (EDD)

if used SPT in dynamic environments large jobs may never get process

Define shorted processing time rule (SPT)
Minimize average flow time and WIP inventory

Maximize resource utilization

Define EDD rules
Minimize the maximum of jobs past the due dates

does not perform well on avg flow time, WIP inventory, and resource utilization

Define first come first service rules
Used in many service delivery systems

Focuses on time of arrive for the customer or job

Define fewest number of operations left rule
does not consider length of time for each operation

Small operations go last, not very good rules

Define least work remaining rule
Tries to keep down stream workstations and associated resources busy
What is the difference between single resource and two resource sequencing in operation management?
Simplest for of sequencing a set of jobs on a single processor

Bottle neck are terrible for single resources

Two resources

makes sense to try to find a sequence with the smallest make span

What are four major decisions when designing an appointment system?
Determine the time interval for the appointments

Determine the length of each workday and time off of duty

Decide how to handle overbooking

Develop customer appointment rules

What are some short term capacity fluctuations that can result in changes in schedules?
Labor performance
Equipment failures
tooling problems
Labor turnover
What is the Ganett Chart?
Example for monitoring scheduling progress, dark shaded is work completed