HAZOP Hazard and operability study is a structured and systematic examination of a complex planned or existing process or operation system in order to identify and evaluate problems that may represent risks to personnel or equipment.
HAZID - Hazard Identification is the method of identifying hazards in operations and process, which forms the essential first step of a risk assessment. This will be carried out in many possible purposes in identifying hazards.
HAZMAT - Hazardous material is a process any chemical product or agent (biological, chemical, radiological, and/or physical), which has the potential to cause harm to humans, animals, or the environment, either by itself or through interaction with other factors.