The main points from this module are as follows:

Occupational Health and Safety Management Systems help companies to improve their occupational health and safety performance continually.
Some of the national standards for implementing OH&SMS systems, prior to ISO 45001:2018 have been: BS OHSAS 18001; ANSI/AIHA Z10 and CSA Z1000.
The BS OHSAS 18001, Occupational Health & Safety Assessment Series, is a globally recognized British Standard for occupational health and safety management systems.
ANSI stands for the American National Standards Institute. The Accredited Standards Committee “Z10” approved the standard in 1999.
The Canadian Standards Association (CSA), published a standard for Occupational Health and Safety Management Systems, in 2006, known as CSA Z1000-6.
The ISO 45001 standard matches closely with the newly revised ISO 9001:2015 quality management system and the ISO 14001:2015 environmental management system. Both similarly employ a risk-based structure.
The committee responsible for the development of the ISO 45001 standard is known as ISO/PC 283. 
Experts from approximately seventy countries, collaborated on the drafting of ISO 45001. 
The British Standards Institution (BSI), served as the committee’s secretariat for the development of ISO 45001.