Nielsen J. Coordinating User Interfaces for Consistency 1989

Textbook in PDF format

The core principles of interface consistency are as persistent and as valuable as when this book was first published. Contributed chapters include details on many methods for seeking and enforcing consistency, along with bottom-line analyses of its benefits and some warnings about its possible dangers. Includes Bruce Tognazzini's classic chapter on how he evangelized consistency for the Macintosh. Most of what you'll learn applies equally to hardware and software development, and all of it holds real benefits for both your organization and your users