As is understand, the control of occupational health hazard is divided into 3 group:

Principle of control Hierarchy of control Adequacy of control As you mention above comment for hierarchy of control, I would like to add a few more of hierarchy of control which include the total enclosure, isolation, and modification of process parameter. I am totally agreed with you that by controlling exposure to hazard in the workplace, the number of accident can be prevent hence it will protect everyone to be safe.

From above statement, what can be explained ?