Incident investigation: evidence vs assumption in a study case

Treat an explanation as something to test

CCOHS describes incident investigation as gathering information, analyzing it and developing findings and recommendations. It warns against premature conclusions and encourages considering possible causes. In this study exercise, the goal is to identify evidence gaps before settling on an explanation.

Use three headings in your notes: observed or recorded, reported by a person, and hypothesis. A reported statement is evidence that someone gave that account; it does not automatically establish every detail as independently verified. A hypothesis is a question to investigate, not a fact to copy into the conclusion.

The fictional cart near miss

A cart carrying boxed supplies contacts a door frame. Nobody is reported injured in the training scenario. A photograph taken afterward shows the cart beside the frame and one wheel angled outward. A colleague says, “I heard a bang and turned around.” Another person says, “The delivery was running late.”

The draft conclusion reads, “The operator rushed because the delivery was late, and a faulty wheel caused the collision.” The story contains no verified speed, inspection result, pre-contact wheel position or account establishing the operator's decisions. The conclusion has joined several possibilities into one unsupported narrative.

Sort each item without losing useful clues

The wheel and timing clues are not discarded. They remain useful leads whose relationship to the event needs investigation.

Choose questions that discriminate between explanations

A stronger classroom analysis asks what the wheel condition was before contact, what the route and task arrangements were, and what witnesses actually saw. Each question could change the explanation. Asking only whether the operator knew a rule may leave other relevant possibilities unexplored.

Consider two hypothetical later findings. An authorized examination identifies pre-existing wheel damage, or it identifies damage consistent with the contact. Those findings would have different implications. The original photograph alone cannot choose between them. This is an exercise in reasoning about supplied evidence, not instructions to disturb a real incident scene or inspect damaged equipment.

Write a conclusion that matches the evidence

At the current stage, a defensible note is: “The cart contacted the door frame. The available after-event image and accounts do not yet establish the contributing factors. Wheel condition, route arrangements and the reported schedule context require further examination.” It is specific about both knowledge and uncertainty.

When answering practice questions, watch for explanations that introduce motives or a single root cause without evidence. Prefer the option that addresses the question and preserves plausible alternatives until the facts distinguish them. Use incident-investigation practice to test this habit with a different case.