Definition
Scoring Matrix
The table defining what each score means for each question.
A scoring matrix is the table a buyer uses (and often publishes) to show how marks will be awarded across each evaluation question, typically combining the question weighting, the scoring scale, and any descriptors for each score band. Reading it correctly is the fastest way to prioritise bid-writing effort.
What a typical matrix contains
Most matrices list each question or criterion down one axis and the scoring scale (commonly 0-5 or 0-10) across the other, with either a fixed descriptor per band or a link to a separate scoring descriptor table. Weightings are shown as percentages or as maximum available points.
- Question reference and short title
- Weighting (% or points) for that question
- Scoring scale, e.g. 0 to 5
- Descriptor or definition for each score band
- Formula for converting raw scores into weighted marks
Using the matrix to plan bid effort
Bid teams should rank questions by weighting and allocate writing time accordingly; a 20%-weighted question deserves substantially more drafting and review time than a 5%-weighted one, regardless of how interesting the topic is.
The matrix also reveals whether scores are pass/fail gated, meaning a response must clear a threshold mark before the rest of the bid is even considered, which changes how risk should be managed in drafting.
Common pitfalls
Suppliers sometimes treat the matrix as decorative and don't calculate their likely weighted score before submission. Modelling a realistic self-assessed score against the matrix, ideally by an internal reviewer using the buyer's descriptors, catches weak sections before submission rather than after debrief.
Frequently asked questions
- Is a scoring matrix always published before submission?
- Best practice under UK public procurement is to publish it, or at least the weightings and scoring scale, in the ITT so bidders know how they will be judged. Occasionally only the weightings are disclosed and the detailed descriptors are internal, though this is less common now.
- How do I convert a raw score into a weighted score using the matrix?
- Typically: weighted score = (raw score ÷ maximum possible raw score) × question weighting. For example, a 4 out of 5 on a 20%-weighted question gives (4÷5)×20 = 16 percentage points towards the total.
- Can I ask the buyer to clarify the scoring matrix before bidding?
- Yes, clarification questions about the scoring matrix, weightings, or descriptors are legitimate and common. Raise them during the formal clarification window rather than assuming or guessing how marks will be applied.
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