Developed jointly by the Association of Commonwelath Universities, the Commonwealth Association of Architects, the Commonwelath Association of Planners and the Commonwealth Local Government Forum, with support from the Government of Rwanda and The Prince's Foundation. The Call to Action recognises the scale of the challenge posed by rapid urbanisation in the context of climate change and the recovery from Covid-19 and argues that we can only engage with the underlying challenges if we do so in an increasingly inter-disciplinary, cross-sector manner, for which the Commonwealth provides an ideal platform.