Residual risk: explain what remains after a control

Define the before-and-after boundary

A fictional visitor centre shares an entrance area with receiving activity. The training case proposes moving visitor appointments to a separate room. Its before-and-after diagram shows a different meeting location, but it does not show the visitors' route from parking to that room.

CCOHS discusses evaluating risk and reviewing controls. For this exercise, use “residual risk” to discuss what remains after the stated control, within the evidence supplied. The useful first step is identifying exactly which part of the original interaction the change addresses.

Read the proposed conclusion carefully

The draft conclusion says, “Visitors now meet elsewhere, so all visitor risk is eliminated.” The first part describes the proposed arrangement. The second extends it to every visitor activity without evidence. Moving a meeting is not the same as documenting arrival, access and departure.

A more precise question is whether the change removes the shared meeting-space interaction and whether another interaction remains on the approach. You do not need to invent a numerical score to recognize that the conclusion has exceeded the diagram.

Create a remaining-question register

The blank areas are questions, not proof that the proposal is ineffective. They show where its claimed result is not yet supported.

Distinguish proposed, installed and functioning

Suppose a later record confirms the new room has been furnished. That supports readiness of the room within the record's scope. It does not demonstrate that every appointment has moved. Suppose an observation then confirms one meeting there. That adds evidence of use, but still does not describe the visitor's route.

Keep the conclusion attached to the specific change and evidence. Otherwise the word “implemented” can conceal several different states: ordered, installed, communicated, used and shown to address the intended interaction.

Write a residual-risk study statement

A bounded answer is: “The proposal addresses the shared meeting location. Its effect on visitor arrival and departure remains unclear because the routes are not supplied. Evidence of actual use and route arrangements is needed before extending the conclusion.”

This answer is useful because it explains the limit, not because it sounds cautious. For a second exercise, imagine the route is confirmed but the room is unavailable on certain days. State which assumption has changed. Continue with control failure modes to examine dependencies without treating a list of controls as proof of performance.