Large-size working drawings are the foundation of any architectural process and 'key' to practical construction of a building, yet very little has been written and published about the architect's quintessential tool. This new book bridges this gap, as it draws on a vast collection of working drawings from many centuries, held by the Department of Architecture at ETH Zurich. This is a collection of plans for a wide range of architectural projects and features many representational techniques. Providing a comprehensive record, around a hundred of the collection's highlights through five centuries, are arranged by category allowing for direct comparison. All plans are depicted entirely in colour on large-size spreads and fold-outs. Full catalogue details are provided for each drawing. Various topics are covered in essays by expert authors, which compliment the images. Featured architects include respected names such as Francesco Borromini, Gottfried Semper, Ludwig Mies van der Rohe, Le Corbusier, Eero Saarinen, Jorn Utzon, Alvaro Siza, Rafael Moneo, Herzog & de Meuron, Peter Zumthor, Diller Scofidio or Caruso St. John.