Leading and Lagging Indicators for OH&S Performance
How to measure occupational health and safety performance before injuries happen, not only after
Key takeaways
- Lagging indicators measure outcomes such as injuries and lost time; leading indicators measure the activities and conditions that prevent them.
- Relying only on lagging indicators tells you about the past and can encourage under-reporting.
- Good leading indicators are linked to your main hazards, measurable, and within the control of the people being measured.
- Injury rates should be normalised by hours worked so they can be compared over time and between sites.
- ISO 45001 requires monitoring, measurement, analysis and performance evaluation (9.1), including the extent to which objectives are met and the effectiveness of operational controls.
1. Lagging and leading: the difference
| Type | Measures | Examples | Strength | Weakness |
|---|---|---|---|---|
| Lagging | Outcomes | Lost-time injuries, recordable injuries, occupational illnesses, days lost | Objective, comparable | Reactive; small numbers make trends unstable; can encourage hiding incidents |
| Leading | Activities and conditions | Inspections completed, near misses reported, actions closed, training completed, safety observations | Proactive; shows effort and system health | Can become box-ticking if not linked to risk |
A balanced set combines both.
2. Calculating injury rates
Rates normalise injuries by exposure (hours worked):
- Lost Time Injury Frequency Rate (LTIFR) = number of lost-time injuries × 1,000,000 ÷ total hours worked.
- Total Recordable Injury Frequency Rate (TRIFR) = number of recordable injuries × 1,000,000 ÷ total hours worked.
- Some organisations use 200,000 hours (about 100 full-time workers for a year) instead of 1,000,000. State which base you use and keep it consistent.
Example: 3 lost-time injuries in a year with 600,000 hours worked: LTIFR = 3 × 1,000,000 ÷ 600,000 = 5.0.
Include contractor hours and injuries where contractors work under your control, and report them separately if needed.
3. Choosing leading indicators
Start from your significant hazards and controls:
| Hazard / control | Leading indicator | Target example |
|---|---|---|
| Forklift and pedestrian traffic | % of traffic management inspections completed and findings closed | 100% inspections, 90% closed within 14 days |
| Work at height | % of permits audited in the field with no deviations | 95% |
| Manual handling | % of high-risk tasks with completed ergonomic assessment | 100% by year end |
| Reporting culture | Near misses reported per 100 workers per month | Increasing trend |
| Corrective actions | % of incident actions closed on time | 90% |
| Competence | % of workers with valid task-specific training | 100% |
| Leadership | Senior manager safety walks completed | 2 per month per manager |
Avoid indicators that measure activity without quality, such as “number of toolbox talks” without checking understanding.
4. Interpreting near-miss reporting
An increase in near-miss reports is usually good news: people trust the system and report. A sudden drop may mean less reporting, not fewer hazards. Look at:
- The ratio of near misses to injuries.
- The quality of reports and actions taken.
- Feedback given to reporters.
5. Presenting performance
- Use monthly trends and rolling 12-month rates rather than single months.
- Show leading and lagging indicators side by side.
- Break down by site, department and contractor.
- Highlight high-potential incidents, even if no one was hurt.
- Report to management review with decisions and resources requested.
6. Common weaknesses
- Only counting injuries, with targets of “zero” that discourage reporting.
- Rates calculated without hours worked, so comparisons are meaningless.
- Leading indicators that are easy to achieve but unrelated to the main hazards.
- Contractor injuries excluded.
- Data collected but not analysed or acted on.
Conclusion
Measuring OH&S performance well means looking forward as well as back. Normalised injury rates show outcomes; well-chosen leading indicators show whether the controls that prevent injuries are actually working. Together, they give management a reliable picture and a basis for action.
Look at your safety dashboard: how many of the indicators would warn you before the next serious injury?