This book presents a specific and unified approach framework to three major components: Search Engines Performance, Link Analysis, and User s Web Behavior. The explosive growth and the widespread accessibility of the WWW has led to a surge of research activity in the area of information retrieval on the WWW. The book can be used by researchers in the fields of information sciences, engineering (especially software), computer science, statistics and management, who are looking for a unified theoretical approach to finding relevant information on the WWW and a way of interpreting it from a data perspective to a user perspective. It specifically stresses the importance of the involvement of the user looking for information to the relevance of information sought to the performance of the medium used to find information on the WWW.