"The nexus of computer science and cognitive science will remain a fruitful area for research and reflection. Humans, computers, and their context form a trinity that will require the sort of insight that these essays embody. If we are to realize the promise of intelligent systems in all their forms, we will need the concepts, methods, and reflections contained in this book." --Nigel Shadbolt, University of Southampton, from the Foreword The notion of Human-Centered Computing (HCC) was introduced as a named program at the NASA-Ames Research Center. Both the evolution of HCC and its current theoretical and research foundations are laid out in the essays that are compiled into this volume. HCC, from this perspective, has the goal of creating technologies that amplify and extend human perceptual, cognitive, and collaborative capabilities. With contributions from more than three dozen coauthors, these 40 essays from the Human-Centered Computing department of IEEE Intelligent Systems lay out and clarify the principles of HCC.