The key aim of this guidance is to reframe cumulative impact assessment (CIA) to help support biodiversity conservation and the achievement of global biodiversity goals (alongside climate and other societal development goals). This guidance is focused on biodiversity and wind and solar development, and is aimed primarily at government planners and project developers. The report applies approaches for government-led CIA and project-level CAI. However, since it is designed to help tackle some of the existing challenges of CIA, there is potentially broader applicability.