Performance evaluation is a critical stage of software- and hardware-system development that every computer engineer and scientist should master. Although complex – requiring skills in mathematics, measurement techniques and simulation – performance evaluation is primarily an art; indeed, the most difficult stage in a performance analysis is defining the approach: once you know what to do, it is less difficult to define a plan of attack with your familiar software tools.

The book first elaborates on the current ecology of the World Wide Web, where autonomous information sources come and go in dynamic and unpredictable ways.