Climate assemblies can be organised for different reasons and designed in different ways. As such, their impact and legacy can be multifarious. This research brief considers the different forms of impact that climate assemblies can have and how this can affect their legacy. Through a systematic rapid evidence review of existing literature on climate assemblies and insights from citizen assemblies more generally, as well as interviews with expert practitioners, this briefing considers different definitions and typologies of impact targets and their antecedents. These include policy, media discourse, participant attitudes and social activism; the variety of actors affected include public authorities, publics, media non-governmental organisations and business. The ambition is to produce a synthesis of current knowledge of the pathways to impact and legacy of climate assemblies.