Architects intensively use graphic representations to communicate their design ideas for themselves, between professionals, and others. The design drawing therefore, is an important medium to establish design support by means of computers. In order to make drawings accessible for computers, it is necessary to understand the conventions of depiction and encoding that architects use. In this book the author presents his ongoing work to achieve this goal. It is investigated how graphic representations are structured, what these structures are, what their knowledge content is, how they can be used to analyse design processes, and how they can be applied in Computer-Aided Architectural Design as intelligent drawing tools, both by means of enhanced drawing tools, and by means of automated drawing recognition.