“… Case studies relying on semi-structured interviews plus observation plus document analysis (Abdalla and Siti-Nabiha, 2015;Biswas and O'Grady, 2016;Järvenpää and Länsiluoto, 2016;Luke et al, 2013;Sundin and Brown, 2017;Vesty et al, 2015) Case studies based on semi-structured interviews plus analysis of internal and/or publicly available documents (Arunachalam et al, 2016;Bui and de Villiers, 2017;Dillard et al, 2010;Egan, 2014;Fallan, 2015;Ferreira, 2017;Fraser, 2012;Gunarathne et al, 2016;Hossain et al, 2017;Kotonen, 2009;Länsiluoto and Järvenpää, 2010;Lauwo et al, 2016; Luque-Vílchez and Larrinaga, 2016) Semi-structured interviews plus observation (Bebbington et al, 2009; 2015; Yu and Rowe, 2015) Observation plus document analysis (Johansen, 2008) Semi-structured interviews plus a survey (Botes et al, 2014;Collison et al, 2009;Gadenne et al, 2012;Kreander et al, 2009;Williams, 2015) Semi-structured interviews plus analysis of government statistical data (McPhail et al, 2010) Alongside the increased use of multiple data sources some authors have experimented with novel approaches to engagement research in sustainability accounting and performance. Adams and McNicholas (2007) in the 2007 special issue conducted an action research case study, an approach which has since been used by Bessire and Onnée, (2010), Chung and Windsor (2012) and Horváth et al, (2014), among others. Ramsden et al, (2014) reported on a collaboration between an academic institution, NGOs and a municipal entity to calculate the greenhouse gas (GHG) inventory of a city noting that it "could serve as a mo...…”