Supplementary guidance

The Green Book sets out the broad framework for the appraisal and evaluation of all policies, programmes and projects. The supplementary and Departmental guidance below contains more detailed guidance on specific issues and applying the Green Book in particular contexts.

Asset Valuation - Valuation of Public Sector Assets
Competition
Crime
Discounting
Future costs and benefits should be discounted at an annual rate of 3.5% to take account of consumption growth over time, catastrophe risk and pure time preference.
Environment
Includes climate change, greenhouse gas emissions, floods and sustainability.
Health
Multi-Criteria Decision Analysis
A method for assessing a mix of both monetary and non-monetary impacts.
Optimism Bias
Peforming adjustments for project appraisers’ tendency to be overly optimistic about the predicted costs, benefits and works duration of projects.
PFI
Guidance on taxation adjustments when comparing PFI with the Public Sector Comparator.
Regeneration and the Regions
Guidance on regeneration - reversing economic, social, and physical decline in particular regions; additionality - assessing the net rather than gross impact of proposals with regional or local aims (i.e. taking account of what would have happened in the absence of intervention, and looking outside of the target area or group to account for leakage, displacement and substitution effects); and specific guidance for Regional Development Agencies.
Risk
Stated Preference Techniques
A survey technique for valuing costs and benefits for which there is no market price.
Transport
Valuing infrastructure spend

Supplementary guidance

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