Book excerpt: An introduction to architectural thought, this text is a thorough and accessible discussion in search of the principles of the design process. Documenting the non-verbal processes and decisions that architects and designers make is a difficult task, but one that is important when trying to understand the development of architectural design through the ages. Michael Brawne uses his experience as a practicing architect, academic and educator to provide an overview of the subject. By looking at the practices and buildings of architects past and present he incorporates history and philosophy in the search for a theory of design.