The document discusses key concepts in architectural theory through a series of debates. It introduces the book "Introducing Architectural Theory" which presents architectural subjects like tectonics, use, and site as conversations between historical theorists. Each chapter introduces questions to help readers develop their own theories. The book structure includes original texts by architects, reflective texts by critic-architects, and philosophical texts. It aims to get readers thinking critically about architecture. Debates discussed in the book include simplicity vs complexity, ornament vs austerity, and materiality vs immateriality. These debates illustrate how architecture involves ongoing discussion around aesthetics, structure, function and other topics.