A great introduction to the concepts of cloud computing and the use your business may make of it. Assumes no prior knowledge at all (other than basic familiarity with computers - but importantly from the perspective of a business that uses them, not that of an infrastructure technician). Will guide you through the maze of jargon and enable you to make sensible decisions about how and what to explore further. The most important aspect of the book for me was the balanced perspective - Dr Williams does not pretend that cloud computing will solve all your business issues, but instead presents both the upsides and the hard questions you should be asking your provider before you make any commitments. All in all an accessible, no-nonsense introduction which may not be the last thing you read on cloud computing, but is an excellent place to start.