This retrospective interview study focused on the impact that training and implementation of Philosophy, in Lipman's tradition of Philosophy for Children, had on the pedagogy of 14 primary teachers at one school. Semi-structured interviews were conducted to document the impact of teaching Philosophy on pedagogy, the resources required to facilitate and sustain such change, including the necessary dispositions required to teach Philosophy, and the critical junctures in pedagogical change associated with teaching Philosophy. Interview data were coded and analysed to generate a grounded theory regarding the efficacy of teaching Philosophy in terms of its impact on the pedagogy of the teachers interviewed. This pedagogical transformation is then theorised in terms of Vygotsky's Zone of Proximal Development re the learning of the adults in this study. This study formed the pilot for a larger empirical study.