A textbook for graduate and senior undergraduate students and practicing engineers in the telecommunications and Internet world. Pitts and Schormans (both electrical engineering, U. of London) introduce the design and performance issues surrounding Internet Protocol (IP) and Asynchronous Transfer Mode (ATM). They discuss performance evaluation by analysis and simulation, key formulas describing traffic and queueing behavior, and practical examples of designing networks. They encompass comments on the 1996 edition, titled Introduction to ATM Design and Performance.