Learning about artificial intelligence is particularly problematic for the non-computer specialist. Delving deep into the complexities of the programming principles involved in simulating thought processes often serves to mystify rather than enlighten those who need to build up a practical and working knowledge of AI. How Machines Think takes a unique approach, aiming to introduce those without a mathematical or scientific background to key AI concepts. Programming details are given in PROLOG (using the most universally accepted and clearest version of this AI language) but with parallel plain English versions, so the book can be read in either language. 'Moving' cut-out examples of key programming ideas are supplied, graphically illustrating 'how' the programs work. Complex working systems which are producing impressive results are explained simply and the philosophical issues surrounding the attempts to imbue computers with 'intelligence' are discussed clearly and concisely.