Mental fatigue and error rates in critical tasks
Protect critical work with task specific controls. Fatigue concerns require hazard assessment, not a generic employee resilience programme.
The performance question
A checking task, operational handover or release approval can fail for several reasons. When consequences are material, examine staffing, timing, information and independent verification. A fatigue explanation must not replace investigation of equipment, training or procedure failures.
What the evidence supports
HSE lists slower reactions, reduced attention and memory lapses as fatigue effects, and says fatigue can lead to errors and accidents. It emphasises employer risk management and notes that working time compliance alone is insufficient.[1]
A practical approach
Identify tasks where an error could cause serious harm or material loss. Review actual hours, on call demands, breaks and task timing with competent safety advisers. Provide independent checks, relief or rescheduling where indicated by assessment. Use established incident reporting and stop work arrangements for immediate concerns.
How to review progress
Monitor errors and near misses with exposure denominators and reporting changes in mind. Inspect whether controls were used and whether fatigue risks remained. Never infer that a lower report count proves safety if staff no longer feel able to report.
Sources and references
- Human factors: Fatigue Opens in a new tab
Health and Safety Executive
Why fatigue matters and key principles for managing working hours