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Hfacs

The document outlines the Human Factors Analysis and Classification System (HFACS) framework. It shows that unsafe acts occur due to preconditions such as adverse mental states or physical limitations. Unsafe acts can include errors or violations. Preconditions are influenced by unsafe supervision such as inadequate supervision. Unsafe supervision and preconditions are impacted by broader organizational factors like resource management and culture. The framework provides a way to investigate accidents and also take proactive steps to address failures in a system's defenses.

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Sixsigma Tqm
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125 views7 pages

Hfacs

The document outlines the Human Factors Analysis and Classification System (HFACS) framework. It shows that unsafe acts occur due to preconditions such as adverse mental states or physical limitations. Unsafe acts can include errors or violations. Preconditions are influenced by unsafe supervision such as inadequate supervision. Unsafe supervision and preconditions are impacted by broader organizational factors like resource management and culture. The framework provides a way to investigate accidents and also take proactive steps to address failures in a system's defenses.

Uploaded by

Sixsigma Tqm
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Human Factors Analysis

and Classification System


(HFACS)
Organizational
Factors Dr. Shoeb Ahmed Ilyas
Ruby Med Plus
Unsafe
Supervision
Pre-
Conditions
for
Unsafe
Acts
Unsafe
Acts

4/8/2018 Prof. Dr.Shoeb Ahmed Ilyas 1


Swiss Cheese Model

4/8/2018 Prof. Dr.Shoeb Ahmed Ilyas 2


UNSAFE
ACTS

Errors Violations

Skill-based Decision Perceptual


Routine Exceptional
Errors Errors Errors

Unsaf
e
Acts

4/8/2018 Prof. Dr.Shoeb Ahmed Ilyas 3


PRECONDITIONS
FOR
UNSAFE ACTS

Substandard Substandard
Conditions of Practices of
Operators Operators

Adverse Physical/ Crew Non-Supervisory


Adverse Personal
Physiological Mental Resource Tolerance of
Mental States Readiness
States Limitations Management Unsafe Acts

Preconditions
for
Unsafe Acts

Unsafe
Acts

4/8/2018 Prof. Dr.Shoeb Ahmed Ilyas 4


UNSAFE
SUPERVISION

Unforeseen Known

Unrecognized Inadequate Planned Failure to


Inadequate Supervisory
Hazardous Documentation/ Inappropriate Correct
Supervision Violations
Operations Procedures Operations Problem

Unsafe
Supervision

Preconditions
for
Unsafe Acts

Unsafe
Acts

4/8/2018 Prof. Dr.Shoeb Ahmed Ilyas 5


ORGANIZATIONAL
INFLUENCES

Resource Organizational Operational


Management Climate Process

Organizational
Influences

Unsafe
Supervision

Preconditions
for
Unsafe Acts

Unsafe
Acts

4/8/2018 Prof. Dr.Shoeb Ahmed Ilyas 6


Human Factors Analysis
Provides More than just an
Accident Investigation Tool
Organizational
Factors
Opportunity for
Pro-active Action
Unsafe
Supervision by Management

Preconditions
for
Unsafe Acts

Unsafe
Acts
Failures in your
System’s Defenses

4/8/2018 Prof. Dr.Shoeb Ahmed Ilyas 7

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