Process analysis ( HAZOP, SIL, LOPA, QRA ) is a structured method used to identify hazards or safety critical issues in the process design or operation phases of the engineering / operation project. Process analysis may be required in order to comply with regulatory requirements (such as the OSHA process safety management standard), industry best practices, and HAZOP , ISA 1000, SIL and LOPA are related techniques that are used during this phase of a project. Process analysis is a method for the thorough examination of the processes involved in designing and releasing new systems. It involves a systematic examination of the whole process from start to finish. It is a method used to evaluate the design of complex systems. Process analysis is used to identify potential hazards and locate areas in which hazardous situations can occur. Any process analysis will consist of four different classifications: Hazardous Operations, Individual LOPA , System LOPA, and Quantitative Risk Assessmen