1. The University of Adelaide, School of Computer Science
Security Supervision and Management
Theory and Practice of Asset Protection, 4th Edition
The University of Adelaide, School of Computer Science
2 June 2018
Chapter #5
The Theories of Accident Causation
Copyright © 2015, Elsevier Inc. All rights Reserved
Chapter 2 — Instructions: Language of the Computer

2. Heinrich’s Domino Theory
The University of Adelaide, School of Computer Science
2 June 2018
Heinrich’s Domino Theory
Five stages
Social environment and ancestry
Faults of a person
Unsafe act or condition
Accident
Injury
Copyright © 2015, Elsevier Inc. All rights Reserved
Chapter 2 — Instructions: Language of the Computer 2

3. Ferrell’s Human Factor Model
The University of Adelaide, School of Computer Science
2 June 2018
Ferrell’s Human Factor Model
Theory identifies three main causes
Overload
Incompatibility
Improper activity
Copyright © 2015, Elsevier Inc. All rights Reserved
Chapter 2 — Instructions: Language of the Computer 3

4. Petersen’s Accident/Incident Model
The University of Adelaide, School of Computer Science
2 June 2018
Petersen’s Accident/Incident Model
Similar to Ferrell’s Human Factor Model
Ergonomic traps
Separates the decision to err from the overload cause
Reasons to choose to err
logical decision due to the situation
an unconscious desire to err
perceived low probability of an accident occurring
Copyright © 2015, Elsevier Inc. All rights Reserved
Chapter 2 — Instructions: Language of the Computer 4

5. Copyright © 2015, Elsevier Inc. All rights Reserved
The University of Adelaide, School of Computer Science
2 June 2018
Systems Models
A system model view sees a harmony between man, machine, and environment
Risk-taking
Copyright © 2015, Elsevier Inc. All rights Reserved
Chapter 2 — Instructions: Language of the Computer 5

6. Reason’s Swiss Cheese Model
The University of Adelaide, School of Computer Science
2 June 2018
Reason’s Swiss Cheese Model
Every step in a process has the potential for failure
Holes in the layers of defense
Two types of failure
Active
Latent
Copyright © 2015, Elsevier Inc. All rights Reserved
Chapter 2 — Instructions: Language of the Computer 6

7. The Integration of Theories and General Safety Program Implications
The University of Adelaide, School of Computer Science
2 June 2018
The Integration of Theories and General Safety Program Implications
All theories are incomplete
Only explain a portion of accidents
True accident prevention can only occur when all possible causes are addressed
Copyright © 2015, Elsevier Inc. All rights Reserved
Chapter 2 — Instructions: Language of the Computer 7

8. Copyright © 2015, Elsevier Inc. All rights Reserved
The University of Adelaide, School of Computer Science
2 June 2018
Emerging Trends
Fines by the Occupational Safety and Health Administration (OSHA) have been increased
More states are legislating safety standards
Copyright © 2015, Elsevier Inc. All rights Reserved
Chapter 2 — Instructions: Language of the Computer 8