Why ISO 45001 Is Essential

Every year, thousands of workplace accidents and occupational diseases affect businesses. Beyond the human tragedy, the consequences are severe: lost work time, increased insurance premiums, criminal liability, and reputational damage. ISO 45001, published in March 2018, is the first international standard for Occupational Health and Safety (OHS) management systems.

It replaces OHSAS 18001 and introduces a more modern vision, centered on prevention, worker consultation, and integrating OHS into the organization’s strategy.

What Changed from OHSAS 18001

Aspect	OHSAS 18001	ISO 45001
Structure	Proprietary	HLS (common ISO structure)
Approach	Reactive (hazards)	Proactive (risks AND opportunities)
Leadership	HSE manager	Top management
Workers	Consulted	Actively participate
Context	Not required	Mandatory analysis
Contractors	Partially covered	Fully integrated
Life cycle	Not addressed	Taken into account

The Pillars of ISO 45001

1. Leadership and Worker Participation

This is the most significant change. Top management can no longer delegate OHS solely to the HSE manager:

Top management must be accountable for the effectiveness of the OHS system
Workers must participate in hazard identification, risk assessment, and defining control measures
Consultation is not optional – it is a normative requirement

An OHS system that truly works is one where every worker feels empowered to report a hazard, without fear of retaliation.

2. Hazard Identification and Risk Assessment

ISO 45001 requires a systematic approach:

Categories of hazards to consider:

Physical (noise, vibration, extreme temperatures)
Chemical (hazardous substances, dusts)
Biological (infectious agents, allergens)
Ergonomic (postures, manual handling, screen-based work)
Psychosocial (stress, harassment, workload)
Organizational (lone working, atypical schedules)

Assessment process:

Identify work activities and situations
List associated hazards
Assess risks (likelihood x severity)
Define the hierarchy of control measures
Implement and verify effectiveness

3. The Hierarchy of Controls

The standard mandates a priority order for treating risks:

Elimination: Remove the hazard at its source
Substitution: Replace with something less hazardous
Engineering controls: Isolate people from the hazard (collective protection)
Administrative controls: Procedures, training, signage
PPE: Personal Protective Equipment (last resort)

Too many organizations start with PPE. The standard requires you to start from the top.

4. Planning and Management of Change

Every change must be assessed from an OHS perspective:

New processes or equipment
Changes in work organization
New chemical products
Facility changes
Engaging new contractors

Implementing Your OHS System: Key Phases

Phase 1: Diagnostic and Commitment

Conduct a comprehensive OHS baseline assessment
Analyze regulatory compliance (labor code, classified installations, workplace accident/occupational disease regulations)
Obtain formal commitment from top management
Assemble the project team

Phase 2: Analysis and Planning

Map all positions and activities
Identify hazards and assess risks
Draft or update the occupational risk assessment document (DUERP in French regulatory context)
Define the OHS policy and objectives
Plan risk reduction actions

Phase 3: System Design

Define OHS processes (accident management, investigations, authorizations…)
Establish operational control procedures
Organize emergency preparedness and response
Structure OHS regulatory monitoring
Define performance indicators (leading and lagging)

Phase 4: Deployment

Train and raise awareness across all personnel
Implement planned prevention actions
Launch safety talks and field inspections
Deploy incident reporting tools

Phase 5: Verification and Certification

Conduct OHS internal audits
Perform the management review
Analyze indicators and trends
Undergo the certification audit (Stages 1 and 2)

Essential OHS Indicators

Lagging Indicators (Reactive)

Lost Time Injury Frequency Rate (LTIFR)
Severity Rate
Number of lost workdays
Number of declared occupational diseases

Leading Indicators (Proactive)

Number of near-misses reported
Completion rate of field safety inspections
Percentage of positions with up-to-date risk assessments
OHS training completion rate (actual vs. planned)
Number of safety talks conducted
Average turnaround time for prevention actions

The best OHS systems measure what they prevent, not just what happens.

Field Best Practices

Building a Safety Culture

Make OHS visible: Posters, signage, dashboards on the shop floor
Engage managers: They are the essential link between policy and the field
Value near-miss reporting: Every near-miss reported is a win
Address behaviors, not just outcomes: Not wearing PPE is a problem, even if nothing happened
Communicate successes: X days without an accident, successful prevention actions…

Toolbox Talks

A simple yet powerful tool:

10-15 minutes before the start of the shift
A concrete topic related to the day’s activities
Interactive discussion, not a lecture
Documented and archived

ISO 45001 and the Occupational Risk Assessment Document (DUERP)

The DUERP (Document Unique d’Evaluation des Risques Professionnels) is a regulatory obligation under French law. ISO 45001 goes further, but the two approaches are complementary:

The ISO 45001 risk analysis directly feeds the DUERP
The DUERP becomes a natural deliverable of the OHS system
The annual DUERP update integrates into the standard’s PDCA cycle

With a tool like Betterfly, the DUERP is automatically generated from your risk analysis, always up to date and accessible to all.

Conclusion

ISO 45001 is much more than a standard: it is a commitment to your employees. It structures your prevention approach, holds top management accountable, and gives workers a voice.

The organizations that succeed in certification are those that do not see it as an HSE project, but as a company-wide initiative. Safety is not a cost – it is an investment in your most valuable asset: the people who make your organization what it is.

Betterfly helps you structure your OHS system with risk management tools, accident and near-miss tracking, and real-time OHS dashboards. Request a demo to discover how to protect your teams more effectively.