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In this paper, we outline a new proposal for communicating scientific debate to policymakers and other stakeholders in circumstances where there is substantial disagreement within the scientific literature. In those circumstances, it seems important to provide policy makers both with a useful, balanced summary that is representative of opinion in the field large, and to transparently communicate the actual evidence-base. To this end, we propose the compilation of argument maps through a collective intelligence process; these maps are then given to a wide sample of the relevant research community for evaluation and summary opinion in an IGM style IGM style poll (see igmchicago.org), which provides a representative view of opinion on the issue at stake within the wider scientific community. Policymakers then receive these two artefacts (map and poll) as their expert advice. Such a process would help overcome the resource limitations of the traditional expert advice process, while also providing greater balance by drawing on the expertise of researchers beyond the leading proponents of particular theories within a field. And, the actual evidence base would be transparent. In this paper, we present a pilot project stepping through the map building component of such a policy advice scheme. We detail process, products, and issues encountered by implementing in the OVA (Online Visualisation of Argument tool, ova.arg-tech.org) an argument map with sample evidence from the behavioural literature on communicating probabilities, as a central issue within pandemic.