This volume provides the formal methods practitioner with a survey of the key software specification methods. Each technique is demonstrated using the same case study - an invoicing system - to enable the reader to compare and contrast easily. Among the techniques covered are: UML, Z, SAZ, B, JSD, OMT, VHDL, Estelle, SDL and LOTOS. Most specification courses tend to focus on 1 or 2 key techniques and to have a theoretical bias; this book provides a basic overview of the main methods, and has a practical focus that allows the reader to apply their knowledge to real-life situations. It will prove essential reading for all industrial and commercial practitioners who need to expand their knowledge of software specification methods.