A development of the material and constructional idea of structure, substrate and skin through a focus on the application of materials in conventional and non-conventional details as informed by aesthetics, functionality and environmental sustainability. Core considerations: size, format, edges, junctions and fixings in the constructional and compositional application of materials; the importance of skill as the focus in interior architecture; the role of the interior architect versus the builder/consultant and the coordination between the three. Emphasis is on the documentation of small-scale interior elements and spaces through studio based exercises and precedent studies.