“…Seven of the included studies took place in primary schools ( Dresler-Hawke et al , 2009 ; Goldberg et al , 2015 ; Wickramasinghe et al , 2016 ; Folta et al , 2018 ; Boulet et al , 2019 ; Antón-Peset et al , 2021 ; Karpouzis et al , 2021 ) and three of the studies were in preschools or early childhood centres ( Edwards et al , 2013 ; Boyd, 2015 ; Morris et al , 2018 ). Authors of included studies utilized a range of methods to achieve their aims including direct observation for quantification of food waste or food packaging ( Dresler-Hawke et al , 2009 ; Goldberg et al , 2015 ; Antón-Peset et al , 2021 ), questionnaires ( Morris et al , 2018 ; Boulet et al , 2019 ; Antón-Peset et al , 2021 ; Karpouzis et al , 2021 ), interviews ( Boyd, 2015 ) and focus groups ( Edwards et al , 2013 ; Folta et al , 2018 ; Morris et al , 2018 ). Some of the included studies utilized a theoretical framework, including the socio-ecological model ( Edwards et al , 2013 ; Boyd, 2015 ), social cognitive theory ( Goldberg et al , 2015 ; Wickramasinghe et al , 2016 ), the theory of reasoned action ( Karpouzis et al , 2021 ) and funds of knowledge ( Morris et al , 2018 ); others considered various approaches including behavioural ( Boulet et al , 2019 ) and social marketing practices ( Folta et al , 2018 ).…”