During a hazard identification walk-through, which sources of information should be reviewed?

• A. Process observations only
• B. Material data sheets only
• C. Interviews with workers only
• D. Process observations, material data sheets, and worker interviews

Answer: (D)

A hazard Identification walk-through is most effective when you bring together three complementary sources of information: what you see in the process, what the safety data sheets say about the materials involved, and what workers report about how things are actually done.

Process observations show the real conditions in the workplace—how equipment is operated, how tasks are sequenced, what controls are in place (ventilation, enclosures, barriers), and whether housekeeping or maintenance issues create exposure opportunities. Material safety data sheets provide formal information on hazards, including flammability, toxicity, health risks, spill behavior, required handling and storage, and recommended personal protective equipment and emergency actions. Worker interviews reveal practical insights that might not be evident from documents or observations alone, such as unofficial procedures, recent changes, near-misses, or concerns about outdated labels or incompatible materials.

Combining these sources helps ensure no hazard slips through the cracks. Relying on just one source can miss risks: observations alone might miss outdated or unannotated chemical hazards, MSDS alone might not reflect current practices, and interviews alone might not reveal actual conditions. By reviewing process observations, MSDS, and worker interviews together, you gain a complete and accurate picture of potential hazards.