Occupational health and safety (OHS) is a critical component of any successful organization. By implementing an effective OHS management system, organizations can reduce the risk of accidents, injuries, and illnesses, improve employee morale and productivity, and protect their reputation.
Two of the most widely recognized OHS management systems are ISO 45001 and OHSAS 18001. Both standards provide a framework for organizations to develop and implement an effective OHS management system. However, there are some key differences between the two standards.
In this article, we will explore the key differences between ISO 45001 and OHSAS 18001. We will discuss the similarities between the two standards, as well as the areas where they differ. We will also provide guidance on how to choose the right standard for your organization.

Differences between ISO 45001 and OHSAS 18001
1. Similarities
Despite some key differences, ISO 45001 and OHSAS 18001 have a number of similarities. Both standards:
- Are based on the Plan-Do-Check-Act (PDCA) cycle.
- Require organizations to identify and assess risks to the health and safety of their workers.
- Require organizations to implement controls to mitigate these risks.
- Require organizations to monitor and review their OH&S performance.
2. Key differences
The key differences between ISO 45001 and OHSAS 18001 are as follows:
- Approach: ISO 45001 takes a more proactive approach than OHSAS 18001. ISO 45001 requires organizations to identify and assess risks before they cause harm, while OHSAS 18001 focuses on managing risks once they have been identified.
- Scope: ISO 45001 has a broader scope than OHSAS 18001. ISO 45001 includes requirements for organizations to consider the wider context of their OH&S management system, such as their legal and regulatory obligations, and the needs of their stakeholders.
- Structure: ISO 45001 is structured using the Annex SL framework, which is also used by other ISO management system standards. This makes it easier for organizations to integrate ISO 45001 with other management systems.
3. Certification
Both ISO 45001 and OHSAS 18001 are internationally recognized standards. Organizations can be certified to either standard by a third-party certification body.
4. Migration to ISO 45001
OHSAS 18001 is being phased out and will be replaced by ISO 45001 by March 31, 2023. Organizations that are currently certified to OHSAS 18001 will need to migrate to ISO 45001 by this date.
ISO 45001 is a more comprehensive and proactive standard than OHSAS 18001. It provides organizations with a framework for managing risks to the health and safety of their workers in a more holistic way.
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