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Adaptation to climate change is an important theme in the strategy and policy of institutions around the world. Billions of dollars are allocated every year, based on cost estimates of actions to cope with, or benefit from the impacts of climate change. Costing adaptation, however, is complex, involving multiple actors with differing values and a spectrum of possible adaptation strategies and pathways. Currently, expert driven, topdown approaches dominate adaptation costing in practice. These approaches are subject to misallocation, with global funds not always reaching vulnerable communities in most need. This paper introduces an analytical framework called Participatory Social Return on Investment (PSROI), which provides a structured framework for multi-stakeholder planning, selection and valuation of appropriate methods of adaptation. The broader economic, social and environmental impacts of these adaptation actions are explored and valued through a participatory process. PSROI is strength-based, building local capacity and generating stakeholder buy-in. The financial valuation generated provides an additional tool for examining and prioritizing adaptation actions based on their impact.Results from a pilot of the PSROI framework in a smallholder farming community in Western Kenya provide empirical evidence for the difference between expert driven desk-based and ground-based cost estimates that involve local communities. There was

Debates around the design and content of climate change adaptation policies are shaped, in part, by the power and influence of actors within an adaptation regime. This paper applies a power-mapping technique, Multilevel Stakeholder Influence Mapping (MSIM), to stakeholders in Ghana's agricultural adaptation policy regime. The method provides a quantitative influence score and visual map for actor groups active-in or affected-by the policy process, from the differentiated perspectives of national, regional, and local-level respondents. MSIM, as applied here, seeks to determine the underlying power structure of the adaptation regime and provides insight in to two key power-laden themes: stakeholder participation and multilevel institutional design. Results indicate that when taken collectively (the views of national, regional and local respondents combined) Ghana's adaptation regime is considered bipolar and elite-centred in its power distribution. A distinguishable 'adaptation establishment' or dominant group of power holders made up of technical government and international agencies can be identified. Meanwhile, political groups, the private sector, civil society, and universities are considered to wield substantially less power in the regime. Differentiated perspectives (i.e. national, regional or local respondents alone) reveal that several potential cross-level bridging institutions are not considered influential at all operational levels. Farmers, traditional authorities, and the District Assembly, for example, are all considered highly influential from the perspective of local-level respondents, but their counterpart agencies at the national level are not considered influential by policymakers there. Contrary to the hyper-politicized nature of climate change adaptation at international levels, Ghana's policy regime would benefit from increased participation from political agents, as well as from traditional authorities and farmers. These actor groups can help reverse the a-political nature of the adaptation regime, improve power pluralism across actor groups and levels, and facilitate cross-level cooperation between formal and informal institutions crucial to adaptation success.

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