The so-called ‘Sydney School’ emerged in the late 1950s and its guiding concepts were first outlined by Milo Dunphy in the early 1960s. Although some accounts of the Sydney School phenomenon were published at the time, and further accounts have appeared subsequently, the period remains incompletely documented and analysed. This study set out to more thoroughly account for built works that can be associated with the Sydney School, through an ‘identification framework’ and the systematic collation of documentation in the form of the ‘Sydney School Database.’ Publicly available material relating to the Sydney School was critically reviewed and interviews were conducted with key figures. The resulting material was used to develop an interactive timeline and descriptions of 130 buildings of the period. The results show that the Sydney School represented a genuine design trend whose dominant characteristic was the integration of building design with the natural environment. The originality and significance of this study lies in the fact that, for the first time, an extended range of architects and their buildings have been identified and collated through the ‘identification framework.’ A key contribution of this thesis is the database of projects connected to the Sydney School, which extends extant knowledge of the phenomenon.