All elements of process safety management (PSM) are important, and they all interact with one another. However, it is suggested that three of the elements are of particularly high importance. They are employee participation, hazards analysis and management of change (MOC). 

The topic of Management of Change (MOC) is discussed in the following publications:

• Safety Moment #5: Management of Change — Defining Change and
• Safety Moment #67: The Most Important PSM Elements - Management of Change

In this Safety Moment we look more deeply into the distinction between “In-Kind” and “Not In-Kind” changes.