Barry Dwyer served as a senior lecturer in computer science at the University of Adelaide, Australia, from 1982 – 2004, teaching courses on database and information systems, systems analysis, artificial intelligence, and knowledge representation. Prior to that he was a software engineer working in operating systems, database systems, decision-table translators and automated system construction; and a management services officer and senior computer science lecturer at the University of South Australia. Barry began his career as an electronics engineer in the aviation industry, where he designed analogue flight simulator and radar equipment, and co-designed a digital head-up display system. Since retiring from teaching, Barry has written proof of concept software frameworks that led to the development of this book, and has spoken regularly on these and related topics.