A2.64 Significant unmonetisable values that are important enough to affect key choices about options should be considered at the long-list stage. Strategic examination of the long-list of options can deal with many factors that are likely to be unmonetisable when framing the analysis (as set out in Chapter 4). If valuing social benefits is likely to be difficult, it may still be possible to have an idea of potential costs. As part of indicative costing at the long-list stage this could involve estimating the additional costs of an option which delivers these greater benefits and considering whether the additional costs are worthwhile.
A2.65 At the short-list stage unmonetisable values should form part of the consideration for determining the preferred option. This will involve presenting an assessment of unmonetisable effects alongside estimates of NPSV and describing the potential impacts on a decision.