This article traces the philosophical and theoretical roots of Action Research to rescript its promise for site-based educational formation, reformation and transformation. The process of historicising Action Research through an extensive review of the extant literature, enabled us to establish seven cornerstones that captured the essence of the critical conditions: the practices and practice architectures, that give coherence and comprehensibility to Action Research as necessary for sustained and sustainable change in education. Framing these practices and practice architectures ascornerstones sets down important benefits for contemporary education requiring critical inquiry, rethought purposeful action and systematic responsive development. The cornerstones: contextuality, commitment, communication, collaboration, criticality, collegiality and community, were derived from viewing Action Research from its historical principle committed to democratic way ofworking. It is our position that the cornerstones account for, acknowledge and extend traditional perspectives and descriptions; and assist practitioners deepen understandings about the conditions necessary for opening up generative possibilities of Action Research in ways that do not neglect or lose sight of its core historical connections and democratic virtues.