The scope of a safety engineer is to perform their professional functions. Safety engineering professionals must have education, training and experience in a common body of knowledge. They need to have a fundamental knowledge of physics, chemistry, biology, physiology, statistics, mathematics, computer science, engineering mechanics, industrial processes, business, communication and psychology. Professional safety studies include industrial hygiene and toxicology, design of engineering hazard controls, fire protection, ergonomics, system and process safety, system safety, safety and health program management, accident investigation and analysis, product safety, construction safety, education and training methods, measurement of safety performance, human behavior, environmental safety and health, and safety, health and environmental laws, regulations and standards. Many safety engineers have backgrounds or advanced study in other disciplines, such as management and business administration, engineering, system engineering / industrial engineering, requirements engineering, reliability engineering, maintenance, human factors, operations, education, physical and social sciences and other fields. Others have advanced study in safety. This extends their expertise beyond the basics of the safety engineering profession.