Book excerpt: Since the appearance of simplified 3D sketching programs like SketchUp, architects and interior designers have been called on to use both freehand and 3D CAD drawings, often at very earliest stages of design. Since we must often go back and forth between analytical plan views and 3D visual views, it's important that this be a seamless process, requiring little disruptive action or break in the workflow. Integrated Drawing Techniques closes the gap between creativity and geometry, teaching beginner architects and interior designers how to design their residential interiors using freehand sketching and computer-aided design simultaneously. From concept planning to 3D rendering, this book is a comprehensive guide to designing residences by hand and computer.