Systems Theoretic Process Analysis (STPA) is a systems approach to hazard analysis. It is based on the premise that accidents happen when we lose control. They are a control problem, not a failure problem.

The GATE approach to risk ranking makes risk assessment easier, more accurate and more repeatable by incorporating LOPA insights into the risk matrix approach.

HAZOP is the most commonly applied process hazard analysis (PHA) methodology in the processing industries. It is also the most flawed!

Making Risk Assessment Better, Less Ambiguous and Repeatable - And more Actionable

LOPA provides a consistent basis for judging whether there are sufficient independent protection layers against hazardous events to achieve the risk reduction required to achieve such an explicit target.