Why might the globally worst-WNS scenario not be enough, by itself, to decide which views can be removed from a signoff plan?
From PDVerse MMMC Interview Masterclass · pdVerse Mentor Series
Direct answer
Because WNS is only one lens on risk. A view can be required for unique endpoints, a specific check type, a distinct optimization stage, or regulatory/product coverage reasons even if it has never once been the single worst number in the run.
Mentor explanation
It's tempting to rank views purely by their headline WNS and assume the view at the bottom of that list is safe to drop. But dominance migrates — a view that's never been worst today can become critical after the next ECO, the next CTS iteration, or the next routing pass, precisely because you stopped tracking it closely. Beyond that, a view might exist specifically to cover a class of endpoints that no other active view touches at all, or a check type (transition, DRV, a specific path group) that a WNS ranking doesn't even represent. Removing a view is a coverage decision, and it needs evidence that its unique contribution is genuinely redundant elsewhere — not just evidence that its number currently looks fine.
Interview trap
Reducing a signoff view list based on a single snapshot's WNS ranking, without checking unique endpoints, check types, or historical dominance migration.
Key takeaways
- Because WNS is only one lens on risk.
- A view can be required for unique endpoints, a specific check type, a distinct optimization stage, or regulatory/product coverage reasons even if it has never once been the single worst number in the run.
Self-check: can you answer this aloud?
Try a 45-second answer using this structure:
- State the direct answer.
- Explain the timing or physical reason.
- Name one caveat.
- Say how you would verify it in a real flow.
Continue learning free
Get a practical low-power chapter
Receive the existing “Low Power and Multivoltage Fundamentals” PDF chapter and its download link by email.
Keep connecting concepts