NPI, DFM/DFA & Engineering Change worked example

Assembly Complexity Score with assembly failure severity rating of 3 score: a worked example in npi, dfm/dfa & engineering change

Suppose assembly failure severity rating 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 assembly complexity 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

  • Assembly failure severity rating: 3 score (the input this scenario stresses; the baseline uses 6)
  • Assembly error occurrence likelihood: 4 score (held at the documented default)
  • Assembly error detection difficulty: 3 score (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Assembly complexity risk score = assembly complexity severity score × assembly complexity occurrence score × assembly complexity detection score.
  • Assembly complexity risk score works out to 3.35 score at these inputs, and this is the headline figure for the scenario.
  • Assembly complexity severity score works out to 3 score at these inputs.
  • Assembly complexity occurrence score works out to 4 score at these inputs.
  • Assembly complexity detection score works out to 3 score at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where assembly failure severity rating 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 computes a single assembly-complexity risk number by multiplying severity, occurrence, and detection ratings for an assembly step or operation. 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

  • Assembly complexity risk score: 3.35 score (headline result)
  • Assembly complexity severity score: 3 score
  • Assembly complexity occurrence score: 4 score
  • Assembly complexity detection score: 3 score

Run it with your numbers

  • To rerun this with your own numbers, open the live Assembly Complexity Score calculator, set assembly failure severity rating to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.