This book reminds everyone involved in education, training, human performance engineering and related fields of the enormous importance of human failures in decision-making and performance. The authors emphasize the psychological aspects of performance support, the fundamental limitations of human memory, perception, cognition, conation and psychomotor skills and how they can be reduced through electronic performance support,as one of the most important pursuits of this century. The technological challenges we face today, both globally and locally, are more urgent than most people seem willing to acknowledge, and there is no time to waste putting the ideas expressed in this book into action.