Appraisal Resources

The following resources may be of use when carrying out an economic appraisal or developing a business case.

NIGEAE: A Brief Introduction

This short document introduces some key principles of NIGEAE. It gives brief overviews of appraisal, evaluation, business cases and approval requirements.

The Weighting Scoring Method

This explains how to undertake weighting and scoring, including a worked example.

The Basics of Discounting

This explains how to calculate Net Present Values and Equivalent Annual Costs, using worked examples.

Discount Tables

Tables providing discount factors for calculating net present costs, equivalent annual costs and annuities.

This Microsoft Excel file contains model spreadsheets designed to facilitate net present cost (or net present value) calculations in accordance with current DFP requirements. The file includes an explanation of how to use them.

Optimism Bias Calculators

These Microsoft Excel files contain model spreadsheets designed to facilitate optimism bias calculations in accordance with current DFP requirements and should be used in conjunction with Section 2.6.15 of NIGEAE. The files include an explanation of how to use them.

Example of DEL Accounting Analysis

This example illustrates the differences in accounting treatment between Conventional and PFI procurements. Departments should consult their finance divisions for guidance on how to undertake these calculations in particular cases.