Knowledge

Knowledge notes are short concept pages. For longer explainers see Guides. Return to Resources for topic pathways.

1. Human factors and fatigue

   Fatigue as a human factors issue — how people, tasks, equipment, organisations and environment interact in shift work and operational fatigue risk.

2. Circadian rhythm and fatigue: the circadian low

   How circadian rhythm and the window of circadian low affect alertness, night work, early starts and shift-work fatigue in UK workplaces.

3. Sleep debt and fatigue

   How insufficient sleep and repeated short recovery build accumulated fatigue — and why roster models have limits in UK shift work.

4. Quick return shifts and fatigue

   What quick returns between duties are, why short recovery increases fatigue risk, and how travel and roster review should be considered in UK shift work.

5. Recovery periods and fatigue

   Why rest between duties matters for fatigue management — recovery after nights, overtime, and the difference between time off and effective sleep.

6. Vigilance work and fatigue

   Fatigue risks in sustained attention and monitoring tasks — low-stimulation work, safety-critical observation, night shifts and breaks in UK operations.

7. Task demand and workload fatigue

   How physical and cognitive task demand affects fatigue — workload peaks, high-consequence decisions, breaks and environment in UK shift work.

8. Safety-critical work and fatigue

   What safety-critical work means for fatigue management — alertness, judgement and reaction time in rail, construction, healthcare and infrastructure contexts.

9. Fatigue assurance

   Checking that fatigue controls work in practice — planned vs actual review, records, reporting trends and management learning without audit-proof claims.

10. Organisational policy thresholds

    How organisational fatigue thresholds differ from model outputs — FI, RI, HSE RR446, and when scores should prompt review rather than automatic decisions.