Cleanroom & Contamination Control worked example

Contamination Risk Score with contamination impact severity score of 20 score: a worked example in cleanroom & contamination control

Push contamination impact severity score up to 20 score and the picture changes. This example computes every intermediate figure at that operating point. a team needs to prioritize corrective actions for particle, viable, gowning, material-transfer, or cleaning risks for a contamination risk review

The inputs for this scenario

  • Contamination impact severity score: 20 score (raised for this scenario; the documented default is 8)
  • Contamination event likelihood score: 5 score (unchanged)
  • Detection control weakness score: 4 score (unchanged)

Working through the calculation

  • Applying the documented formula (Contamination Risk Score risk score = contamination impact severity score × contamination event likelihood score × detection control weakness score) to the inputs above produces each figure below.
  • At this operating point the engine returns 10.75 score for contamination risk score risk score, the number this scenario is built around.
  • At this operating point the engine returns 20 score for contamination impact severity score.
  • At this operating point the engine returns 5 score for contamination event likelihood score.
  • At this operating point the engine returns 4 score for detection control weakness score.

How this compares with the baseline

  • Against the tool's baseline example, where contamination impact severity score sits at 8 score and the headline result is 5.95 score, this scenario comes in 80.67% above the baseline at 10.75 score.
  • It multiplies severity, likelihood, and detection weakness into one comparable contamination risk priority number. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Contamination Risk Score risk score: 10.75 score (headline result)
  • Contamination impact severity score: 20 score
  • Contamination event likelihood score: 5 score
  • Detection control weakness score: 4 score

Run it with your numbers

  • Every input above is editable in the live Contamination Risk Score calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.