Certified Safety Professional Practice Exam

Heinrich's Theory, known as the domino theory of accident prevention, is centered around the concept of the "3 E's," which are essential components in creating a safe work environment and preventing workplace injuries. The actual 3 E's reflected in Heinrich's model are Engineering, Education, and Enforcement. These elements emphasize the need for effective engineering solutions to hazards, educational programs to inform workers about safety practices, and enforcement of safety regulations to ensure compliance and accountability.

Engineering Design, while it is a concept related to creating safer work environments through design principles, is not captured specifically within the trio referred to in Heinrich's framework. The inclusion of Engineering, as well as Education and Enforcement, encapsulates the broader elements of safety, which can include various design principles, but the specific terms laid out in the theory do not directly enumerate "Engineering Design" as a standalone category.

The focus in Heinrich's approach is on how these three aspects can be used in tandem to mitigate risks and promote safety rather than dissecting the nuances of design methodologies in engineering. Understanding this distinction helps clarify why "Engineering Design" is not considered one of the foundational 3 E's in Heinrich's Theory.