This book is cheap, short and useful. This is in contrast to many of the 90-odd UML books sold by Amazon which are expensive, waffly and pointless rambling fireside chats with various UML 'gurus'. This book teaches you how to use UML using two case studies. It has no-frills descriptions and examples of all the major UML diagram types in common use. It also has a fairly decent Notation Summary at the end. I have been using UML for two years and this is the only book I still use. Spend the money you save by buying this book on one of the excellent new breed of cheap UML tools. Happy modelling.