This White Paper draws on the collaboratively-written Collective Wisdom Handbook: Perspectives on crowdsourcing in cultural heritage (the Handbook), and two follow-up workshops on ‘advanced questions for crowdsourcing in cultural heritage and the digital humanities’, in addition to the research and experience of its three authors. The Collective Wisdom project aspired to synthesise expert knowledge that until this point had been unpublished, or was only available via grey literature.