Purpose: How to combine whole-life cost with strategic and operational evidence without turning the DMA into either a pure spreadsheet exercise or an unstructured judgement.
How to combine whole-life cost with strategic and operational evidence without turning the DMA into either a pure spreadsheet exercise or an unstructured judgement. This matters because public procurement decisions are rarely isolated events. A choice made during planning can affect competition, affordability, service quality, supplier behaviour and the ability to manage the contract later. The strongest approach is therefore to use the source guidance as part of an end-to-end commercial process, with clear ownership and evidence rather than as a document that is completed after the key decisions have already been taken.
Quick summary
- The DMA guidance separates strategic and operational evaluation from whole-life cost before the results are aligned.
- Consideration areas include strategy and policy, people and assets, transition and mobilisation, service delivery, and risk and impact.
- Criteria should be tailored to the individual service.
- The guidance recommends a numerical scoring methodology with clear score descriptions agreed with stakeholders.
- It also recommends testing findings against real-world experience from similar programmes.
What the guidance means in practice
The source material gives several anchors for that process. The DMA guidance separates strategic and operational evaluation from whole-life cost before the results are aligned. Consideration areas include strategy and policy, people and assets, transition and mobilisation, service delivery, and risk and impact. Criteria should be tailored to the individual service. These are not interchangeable statements: some describe statutory or policy requirements and others describe recommended commercial practice. Teams should identify which category each requirement falls into, apply it to the organisation and procurement in scope, and keep a record of the judgement. Where guidance from 2021 or 2023 predates the Procurement Act 2023, its commercial principles can remain useful, but current legislation, regulations and current statutory guidance take precedence on legal process.
The practical value becomes clearer when the remaining guidance is read alongside the project lifecycle. The guidance recommends a numerical scoring methodology with clear score descriptions agreed with stakeholders. It also recommends testing findings against real-world experience from similar programmes. The final recommendation and underlying assumptions should be documented and capable of later review. In day-to-day terms, this means the buyer should be able to answer three questions at any approval point: what outcome are we trying to achieve, what evidence supports the proposed commercial approach, and what will need to be managed after the decision is made? If those answers are weak, more analysis is normally more useful than adding another layer of narrative to an approval paper.
A practical process to follow
A proportionate process can be built into existing governance. The steps below are deliberately practical. They are not a substitute for the detailed source guidance, legal advice or local standing orders, but they provide a useful structure for a procurement or commercial team.
- Step 1. Define each criterion in plain language and describe what good performance means. Record any assumption that could change the conclusion and when it will be reviewed.
- Step 2. Agree weights and scoring rules before completing the evaluation. Keep the analysis proportionate to the value, risk, novelty and criticality of the requirement.
- Step 3. Set evidence requirements for each criterion. Capture the source evidence and name the person accountable for the next decision.
- Step 4. Build the cost model so it can be understood separately from the qualitative scoring. Record any assumption that could change the conclusion and when it will be reviewed.
- Step 5. Bring the results together in a decision session that records trade-offs and sensitivities. Keep the analysis proportionate to the value, risk, novelty and criticality of the requirement.
- Step 6. Document the recommendation, key assumptions and triggers for later review. Capture the source evidence and name the person accountable for the next decision.
What good looks like
Good practice is visible in the decision trail, not only in the final document. A reviewer should be able to follow the line from the service need, through market and cost evidence, to the route, evaluation, contract terms and management arrangements. Where several functions contribute, the file should show who owns each decision and where challenge occurred. The same principle applies to handover: useful assumptions, models, KPI definitions, risks, supplier information and approval conditions should move into mobilisation and contract management instead of being left in the sourcing archive. This continuity is particularly important for long-running public services, where staff can change but the organisation remains accountable for the outcome.
Recommendations for procurement teams
The following recommendations are suitable for teams that want to embed the topic into normal ways of working rather than create a parallel compliance process:
- Avoid double-counting the same benefit under several criteria.
- Use ranges and scenarios where cost uncertainty is material.
- Explain material differences instead of relying only on the final weighted total.
- Record unresolved evidence gaps.
- Check whether a small cost difference is genuinely decision-significant.
- Retain the evaluation record so future approvers can understand the reasoning.
Common pitfalls to avoid
The most common problems are usually process failures rather than a lack of templates. Watch particularly for the following:
- Changing weights after seeing which option scores highest.
- Using vague criteria that evaluators interpret differently.
- Treating the final score as self-explanatory.
- Hiding uncertainty to make the recommendation look more certain.
Easy-to-read takeaway
For how to align cost and non-cost criteria in a public sector delivery model assessment, the core discipline is to start early, connect the analysis to a real decision and preserve enough evidence for the next stage of the lifecycle. The source material should help teams make better decisions, not merely produce more paperwork. Before acting on a live procurement, confirm the current version of the Procurement Act 2023, regulations, Procurement Policy Notes and any organisation-specific approvals or delegations. This is especially important for thresholds, notice duties, exemptions and policy requirements that can change over time.
Source basis
Primary source used: Delivery Model Assessments Guidance Note, May 2021. Related articles in this collection also draw on the other supplied Cabinet Office, HM Treasury and Procurement Act materials where the topics overlap.
This article is general procurement support content. It should be read alongside current legislation, statutory guidance and your organisation’s own governance and legal advice.