The four pillars of Risk-Based Process Safety (RBPS), a common framework for Process Safety Management (PSM), are: Commit to Process Safety (culture/competence), Understand Hazards and Risk (identification), Manage Risk (operational controls), and Learn from Experience (metrics/investigation). These foundational pillars support a robust system designed to prevent catastrophic incidents. 

1. Commit to Process Safety (Culture & Competency): Focuses on creating a strong safety culture, ensuring leadership accountability, engaging stakeholders, and maintaining competence.

2. Understand Hazards and Risk (Knowledge Management): Emphasizes identifying hazards and analyzing risks, including Process Hazard Analysis (PHA) to understand potential failure consequences.

3. Manage Risk (Operational Controls): Implements safeguards such as operating procedures, mechanical integrity programs, contractor management, training, and Management of Change (MOC).

4. Learn from Experience (Metrics & Improvement): Involves incident investigation, auditing, measuring performance metrics, and conducting management reviews for continuous improvement.