The book is a guide for students and teachers to understand the need for, the role of and the methods and techniques of freehand analytical sketching in architecture. The presentation focuses on drawing as an approach to and phase of architectural design. The conceptual goal of this approach is to use drawing not as illustration or depiction, but as exploration. The first part of the book discusses underlying concepts of freehand sketching in design education and practice as a complement to digital technologies. The main component is a series of chapters that constitute a typology of fundamental issues in architecture and urban design; for instance, issues of "façade" are illustrated with sketch diagrams that show how façades can be explored and sketched through a series of specific questions and step-by-step procedures. In the expanded and updated edition, a new part explores the questions and experiences of large architectural offices in applying freehand drawing in the practice of architectural design. This book is especially timely in an age in which the false conflict between "traditional vs. digital" gives way to multiple design tools, including sketching. It fosters understanding of the essential human ability to investigate the designed and the natural world through freehand drawing.