Associate Safety Professional Practice Exam

What principle is violated by a switch that moves up to shut off a pump?

1. Population stereotype

2. Ergonomic design

3. Safety principle

4. Control feedback

The correct answer is: Population stereotype

The principle of population stereotype refers to the common expectations people have about how controls in a system should operate based on previous experiences and societal conventions. When a switch moves upward to shut off a pump, it contradicts the general expectation that a push up signifies an "on" action, while a downward push typically indicates an "off" action. This mismatch can lead to confusion and potential errors in operation, as users rely on their prior knowledge and intuitive understanding of control mechanisms. In this context, the switch's design fails to align with these established norms, making it less intuitive and potentially hazardous, especially in high-stress situations where quick and correct responses are necessary. Recognizing this principle is essential in safe design practices, ensuring that controls are designed in a way that aligns with user expectations and promotes safe operation.