ISO 9001 - deals with the fundamentals of quality management systems
ISO 14001 - is environmental management system
OHSAS -18001 - is safety management system
There are no similarities between these standards, but you can club all these and can make Integrated management system.
OHSAS 18001 helps all kinds of organizations put in place demonstrably sound occupational health and safety performance
12th December 2014 From India, Noida