Book excerpt: This Companion provides a stimulating and comprehensive overview of planning theory. It brings together authoritative chapters on key issues from a team of respected experts from within and beyond what is narrowly defined as 'planning'. The authors draw on different disciplinary traditions and theoretical frames to explore different ways of conceptualizing spatial planning. The book is divided into four main sections: understandings of place; understandings of governance; imagining futures; and spatial planning and governance in complexity.