Liftbrief / Scorecard
How do you calculate the score without hiding missing evidence?
For a fully evidenced comparison:
Weighted score = Σ [criterion weight × criterion rating ÷ 5].
Keep the underlying rating, evidence reference and reviewer rationale beside every contribution.
For unknown criteria, do not insert an average rating or redistribute their weights:
- Known contribution: total points earned from scored criteria.
- Unresolved weight: total weight assigned to U criteria.
- Possible score interval: known contribution to known contribution plus unresolved weight.
- Evidence coverage: 100 minus unresolved weight, expressed as a percentage.
For example, a proposal with 78 known points and an unscored 10-point criterion should display 78–88/100; evidence coverage 90%. It should not be presented as a completed 86.7/100 score by dividing through only the assessed weight.
Record evidence status separately:
- Verified for its purpose: for example, an official authorisation record or an executed contractual clause.
- Supplier-stated: a written representation requiring further corroboration where material.
- Assumed: a modelling input selected by the buyer.
- Unknown: evidence missing or contradictory.
Verification of a contractual promise establishes what was promised—not that future delivery is certain.
What decision thresholds should apply?
| Completed score | Proposed procurement response |
|---|---|
| 85–100 | Preferred candidate, subject to all gates and required reviews |
| 75–84 | Potentially acceptable; document trade-offs and close specified conditions |
| 60–74 | Renegotiate or restructure before selection |
| Below 60 | Do not shortlist for this requirement without a substantially revised proposal |
Additional controls:
- Require at least 3/5 on criteria 1, 2, 4, 5, 7 and 8 for ordinary approval.
- Require at least 4/5 on recovery for an immovable-deadline mission, unless an independently approved alternative travel plan supplies the missing protection.
- Do not issue an unconditional approval with U criteria or failed gates.
- If candidates are within three points, treat them as a practical tie and inspect the underlying evidence rather than claiming a precise quality difference.
These thresholds are policy choices for buyers to calibrate—not statistically validated cut-offs.