Practical guide
How to evaluate value for money across a public sector change portfolio
Review the public outcomes, financial effects and distribution of value behind portfolio choices, keeping uncertainty and evidence visible alongside affordability.
Wovex
Summary
Evaluate value for money across a public sector change portfolio by examining how feasible choices support public objectives, their costs and benefits, who experiences the effects and how reliable the evidence is. Keep budget impact distinguishable from wider service and social value. Consider dependencies, capacity and alternatives across the portfolio rather than ranking savings alone. Record the judgement and revisit its assumptions as evidence changes, using the appraisal and governance guidance applicable to the organisation and jurisdiction.
State the public objectives and applicable framework
Begin with the public improvement the portfolio is meant to support. A change portfolio may need to improve access, reliability or service outcomes while managing affordability and the capacity to deliver. Lower spending is one possible effect, not a complete statement of public purpose.
Confirm which appraisal, finance and decision requirements apply to the organisation. This guide uses the UK Government’s Green Book 2026 as official context. Its value-for-money approach considers objectives, monetisable and unmonetisable effects, financial impact, distribution, risk and uncertainty. It does not select projects solely by the highest benefit-cost ratio.
That context should not be treated as a universal rule for every public body or country. Establish the relevant jurisdictional guidance and local authorities before using a review to support an actual decision. The practical questions below are not a complete Green Book appraisal.
Review the portfolio through six questions
Use a consistent evidence date and identify the decisions still available. Explain which expectations are forecasts and which claims are supported by completed observations.
Portfolio question | Evidence and interpretation to bring |
|---|---|
What public objectives are served? | The intended service or social improvement, affected population and the reason each initiative contributes. |
What are the financial effects? | Relevant delivery and operating costs, spending changes, timing and affordability, with treatment agreed by Finance. |
What value is outside the budget figure? | Service quality, access, capacity, resilience or other effects represented in meaningful units. |
Who gains or bears the effects? | Differences between groups and places, including people missing from the main evidence. |
How robust is the outlook? | Source quality, assumptions, dependencies and uncertainty that could change the preferred response. |
What choice is justified now? | Feasible options or sequencing, important trade-offs, authority and the next evidence point. |
Keep the financial position understandable alongside wider public effects. A benefit can matter even when it does not reduce an organisation’s expenditure. Equally, an appealing service aspiration still needs an explanation of costs, feasibility and supporting evidence.
Work through an illustrative public service case
Consider a fictional public-service portfolio improving access to a licensing service. It includes online renewal, assisted access through local service points and work to improve the reliability of decisions. The organisation has limited implementation capacity and must decide the next sequence of change.
An online-first option may reduce handling effort for straightforward renewals. That does not establish that it works well for people with limited digital access or more complex applications. An assisted-access option may cost more to operate while preserving access for those groups. A quality initiative may reduce avoidable correction and uncertainty for applicants without producing a large cash saving.
The sponsor needs evidence on the relevant journeys, groups, operating cost and quality, alongside the practical constraints. The preferred sequence might depend on whether assisted access is ready before a channel changes, or whether decision-quality problems should be addressed first.
These are illustrative questions, not a conclusion that one delivery channel is inherently better. No customer data, monetary valuation, appraisal ratio or actual public investment decision is supplied.
Examine distribution, dependencies and portfolio effects
Inspect who is included in the headline result. A fall in average processing time can conceal worse access for a smaller group. Distinguish a genuine improvement from a change in the population observed or a transfer of effort to another service or the applicant.
Review shared dependencies and delivery capacity. Several individually attractive initiatives may depend on the same operational team or data change. Their benefits may arrive later than their separate business cases imply if they compete for that resource.
Check shared claims before combining values. Do not count the same improvement again because it appears in several projects, or add unlike measures into an unexplained portfolio score. The financial and nonfinancial comparison guide supports the presentation of those trade-offs without manufacturing a common monetary total.
Revisit expectations using observed evidence
Investment appraisal asks what is expected from available options. Later review needs to examine what is occurring and whether the original reasoning still holds. The Teal Book connects benefits review to the portfolio cycle, while the Magenta Book provides evaluation context for investigating outcomes and contribution.
For the licensing example, collect evidence of adoption, service experience and operating consequences as the changes enter use. Investigate whether demand, policy or other developments explain part of the movement. A completed rollout or favourable status does not establish that the public outcome was caused by the initiative.
Keep the approved expectations recognisable when revising forecasts. Identify what new evidence could justify a different sequence, smaller commitment or further investigation. Record material uncertainty rather than treating a single figure as an assured future result.
Record the judgement and maintain decision responsibility
Explain the options considered, the principal trade-offs, the evidence available and the reason for the authorised response. Include conditions, action owners and the next review. A transparent judgement can recognise important effects that are not captured by one summary metric.
Preserve the financial, analytical and operational responsibilities supporting the review. Software can organise information, but a saved measure or report does not certify value for money, compliance or the adequacy of an appraisal.
If supporting tools are being procured, use the government and regulated organisations software guide to examine the proposed benefits process and assurance conditions separately. The portfolio decision still needs the applicable official framework, relevant expertise and accountable authority.
Sources and context
UK Government Project Delivery: Teal Book, Chapter 19 — Benefits management.
HM Treasury: Magenta Book — Central Government guidance on evaluation.
The six-question review and licensing-service case are Wovex guidance; the case is fictional. The UK sources supply explicitly scoped public appraisal, benefits and evaluation context. This article is not a complete appraisal, jurisdiction-wide legal interpretation, official value-for-money determination or certification of software compliance.