NPI, DFM/DFA & Engineering Change worked example
Design Freeze Risk with change impact severity at freeze of 3 score: a worked example
Suppose change impact severity at freeze falls to 3 score. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate design freeze risk for npi, dfm/dfa and engineering change using production-ready inputs so teams can rank risks and decide which issue needs containment, controls, or escalation first.
The inputs for this scenario
- Change impact severity at freeze: 3 score (the input this scenario stresses; the baseline uses 6)
- Likelihood of late design change: 4 score (held at the documented default)
- Detectability before freeze: 3 score (held at the documented default)
Working through the calculation
- The calculation starts from the formula this tool documents: Design freeze risk score = design freeze risk severity score × design freeze risk occurrence score × design freeze risk detection score.
- Design freeze risk score works out to 3.35 score at these inputs, and this is the headline figure for the scenario.
- Design freeze risk severity score works out to 3 score at these inputs.
- Design freeze risk occurrence score works out to 4 score at these inputs.
- Design freeze risk detection score works out to 3 score at these inputs.
How this compares with the baseline
- Against the tool's baseline example, where change impact severity at freeze sits at 6 score and the headline result is 4.55 score, this scenario comes in 26.37% below the baseline at 3.35 score.
- It multiplies the severity of a late change, its likelihood of occurring, and how poorly it would be detected before freeze into a single risk priority score. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.
Results at a glance
- Design freeze risk score: 3.35 score (headline result)
- Design freeze risk severity score: 3 score
- Design freeze risk occurrence score: 4 score
- Design freeze risk detection score: 3 score
Run it with your numbers
- To rerun this with your own numbers, open the live Design Freeze Risk calculator, set change impact severity at freeze to your actual value, and adjust the remaining inputs to match your operation.
Last reviewed 2026-05-12.