About Face: The Essentials of Interaction Design review

Alan Cooper's About Face, first published in 1995 and revised through multiple editions, is the foundational text of interaction design as a professional discipline. Cooper invented the concept of user personas — hypothetical archetypes representing user needs and behaviors — and this book is where he first laid out the systematic design approach built around them. The book has been substantially updated in later editions (About Face 3 in 2007, About Face 4 in 2014, co-written with Robert Reimann, David Cronin, and Christopher Noessel), but the core intellectual contribution remains Cooper's original insistence that software should be designed for how people actually think, not for how engineers build systems.

The central argument is that most software fails not because it is technically deficient but because it is designed from the wrong starting point. When engineers design software, they naturally organize it around the underlying data model, the implementation architecture, or the history of how the system was built. Users don't know or care about any of those things: they have mental models built from the tasks they're trying to accomplish and the physical and conceptual metaphors that feel natural to them. The gap between these two frames — the implementation model and the mental model — is the source of most software confusion, frustration, and error.