Class notes

College Notes Advanced Planning & Scheduling

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Course
Advanced Planning & Scheduling (APS)

Institution
Hogeschool Windesheim (HW)

Book
Planning and Scheduling in Manufacturing and Services

This document was created during APS's lessons in the Operational Management in Industry minor at Windesheim. This is in English and will be tested this way.

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Uploaded on May 8, 2023
Number of pages 27
Written in 2022/2023
Type Class notes
Professor(s) J. kabout
Contains All classes

job shop
scheduling
planning
beam search
tabu search
dispatching rules
workforce
machine scheduling
node coloring

Book Title:Planning and Scheduling in Manufacturing and Services

Author(s):Michael L. Pinedo, Michael L. Pinedo

Edition:Unknown
ISBN:9781489985590
Edition:Unknown

Institution
Hogeschool Windesheim (HW)
Education
Technische Bedrijfskunde
Course
Advanced Planning & Scheduling (APS)

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Advanced Planning & Scheduling
Lesson 1 – Chapter 1 + 2 + Appendix C2 and S&OP (Manufacturing)

Difference ERP and APS:
- ERP = transactional system
- Based on MRP-II (Material Requirement Planning)

Work loading:
- Infinite loading = ignores capacity constraints, only helps to
identify bottlenecks
- Finite loading = allows only as much work to be assigned as
can be done with available capacity
APS is:
- Decision making  Computer based
- Allocation  Activities to be done on limited resources
- Business Processes  Manufacturing & service industries
o Procurement, production, transportation, distribution
- Complex  Mathematical techniques & heuristics

1

,Decision making Hierarchy:

Why is planning done hierarchically:
- Certain decisions must be made earlier
o It takes a few years to build a new plant
o It takes several months to hire new people or build new silos
 Exactly what SKU, color, machine, person, sequence on a machine
can be decided later
- Decisions made a higher level determine constraints at lower level
o More constraints on shorter horizon that are the result of earlier decisions
- Uncertainty increases over time
o Range of possible outcomes is larger on longer term
- Aggregated forecasts are usually better
o Longer term forecasts over at family level are more accurate than at SKU
level
- Complexity
o Aggregation is needed at higher level to reduce complexity

S&OP process Different, level different structure &logic

Volume planning = a planning level that does not ‘know’ about orders and which plans
volumes of demand in periods, based on an aggregate resource mode
Order planning = this is the level “where the order comes,” and here the order is
accepted and planned, based on the S&OP plan, more detailed capacity limitations,
and available material on an aggregate level.

Scheduling = this is the level where individual resources or employees are
selected and assigned. In other words, it is where the “what” of the levels above
is translated in a “how” to produce as efficiently as possible

2

, Difference planning & scheduling:
Planning Scheduling
Buckets Bucketless (continuous time)
No sequence Sequencing
No complex constraints, setup times Complex constraints and setup times
Aggregated (families, resource groups) Detailed (SKU, machine/person)

Terminology
- Resource = ‘machine’
Gantt Chart 
- Task = ‘job’
- Job > 1 operations

Product-process matrix

Overview of manufacturing models
Project scheduling Job shop scheduling Lost scheduling
-Precedence constraints -Multiple operations, -Continuous productions
-Typical ojective, minimize different routes -Switching between
makespan -Minimize makespan, products incurs setup cot
-Critical jobs number of late jobs -Minimize total inventory &
-Construction/building -Single machine, parallel setup costs
industry, ERP machines, flow shop -Process industry
implementation - Customized industrial
hardware, hospitals

Statistic data:
 Processing time (pij) = represents the time job j has to spend on machine i
 Release date (rj) = the time the job arrives at the system i.e. the earliest time at
which job j can start its processing
 Due date (dj) = represents the committed shipping or completion date
 Weight (wj) = priority factor, reflecting the importance of job j in the system for one
time unit

3

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