To support the development of the TransformTO climate plan, a diverse group of experts and community members provided advice to the project co-initiators – the City of Toronto Environment and Energy Division and The Atmospheric Fund. The resulting Modelling Advisory Group (or MAG for short),included 35 volunteer members representing multiple sectors within the community and multiple City of Toronto divisions and agencies. The group met four times between July 2016 and March 2017. Their role was to support the scenario modelling process, to undertake multi-criteria analysis of proposed low-carbon solutions, and to offer advice to staff on how to create the TransformTO pathway. The final plan received unanimous City Council approval in July 2017 and is now part of the 2018 budget process.