Updated - April 2026 - The ISA/IEC 61511 Safety Life Cycle starts with a Process Hazard Analysis (PHA) and a Risk Assessment. What is a PHA? Why do we do it? =================================================== Excerpt taken from the webinar: Choosing a Risk Assessment Methodology In the full recording the ANSI/ISA 61511 Safety Life Cycle is shown to start with a Process Hazard Analysis (PHA) and a Risk Assessment. This was the first webinar of our 3 part series and