This document provides an introduction to the Graphisoft ArchiCAD Step by Step Tutorial. It discusses the concept of a virtual building as modeled in ArchiCAD, compared to traditional 2D CAD drafting. It also profiles how different architecture firms utilize ArchiCAD's virtual building tools in their design and documentation workflows. The introduction concludes by explaining how the step-by-step book and interactive content on the accompanying CD-ROM are intended to be used together to guide users through exercises to learn ArchiCAD.