As part of the Arts and Humanities Data Service Project, this Guide to Good Practice covers computer-aided design (CAD). It is a free online handbook "for individuals and organisations involved in the creation, maintenance, use, and long-term preservation of CAD-based digital resources in the humanities." Rather than focusing on a specific software application and situation, the guide discusses a wide range of CAD tools and practices, offering an introduction upon which CAD users can build. The seven chapters describe hardware and software choices, data capturing and documentation, and archiving processes.