This paper presents the findings of the first stage of research on the impact of the Australian Sustainable Schools Initiative (AuSSI) at an independent primary school in Western Australia. A longitudinal (20 year) case study is being conducted, utilizing data related to Education for Sustainability (Emfs) at the school from 1990-2009. 2005 was a critical year for the school because it marked the beginning of participation in the Sustainable Schools Initiative pilot in Western Australia (Aussie-WA). The research investigates elements of Emfs in operation at the school Prue- and post-Aussie-WA, as well as student and teacher outcomes after involvement in the Initiative. An analysis of the initial data suggests that participation in Aussie-WA enabled the school to engage with a growing commitment to Emfs in the context of a whole-school approach. (Contains 3 tables and 3 figures.)