It is indeed a great pleasure and privilege to present the book on "Bandwidth Approximation Module for Improving QoS in IEEE 802.11e LAN" that will help the students of Computer Science. The style adopted is quite simple and is fully supported by the illustrations at the appropriate places. The primary aim of the authors has been to present the material in a comprehensive manner so as to help the students to easily grasp this subject. While writing the book, it was kept in mind to include only the relevant topics so that it is useful both for learning and reference purpose. The book consists of six chapters. Every effort has made to make this book error free. We welcome all the constructive criticism of the book.