Page 4 - HFACS Flipbook Holcim v 1.2

HFACS TIERS

HFACS consists of four broad categories of factors known to
contribute to errors and accidents. These include:

Unsafe Acts
Preconditions for Unsafe Acts
Supervisory Factors
Organizational influences

Unsafe Acts
The unsafe acts of operators can be classified as either an error
or violation. In general, an error represents normal accepted
behavior that fails to achieve the desired outcome. Violations,
on the other the result of intentional departures from practices.
The operative term here is “International” meaning the
individual knew the accepted practice yet chose to disregard it.

Preconditions for Unsafe Acts
To fully understand the causal chain of events, one must dig
deeper into why the unsafe acts took place, essentially asking:
"How was this day different from any other?"
The process involves analyzing preconditions of unsafe acts,
which include situational factors, the condition of the operator
and personnel factors
.

2022 Holcim Group HSE