Information users and usability constitute the main building blocks of today's electronic information world. This important new text is the first to give a holistic overview of all of the necessary issues relating to information users and the usability of information services in the digital world, including user- centred design, and the characteristics and behaviour of information users. This book helps readers understand why information users and the usability of information services are important and equips them to play a proper role in designing user-centred information systems and services and to properly exploit information services for the maximum benefit of users. It covers all of the major issues, the current situation and what the various research studies from around the world show. This work is essential reading for researchers and practitioners interested in the design and evaluation of digital information systems and services, as well as for students on library, information, and digital library courses.