Additional key features of the 2nd edition include: Technical description of new (state-of-the-art) eye tracking technology (new chapters 9, 10, and 11); a complete whole new Part describing experimental methodology including experimental design, empirical guidelines, and 5 case studies (new chapters 13, 14, and 15); survey material regarding recent research publications included within Part IV. This second edition is a invaluable guide for practitioners responsible for developing or implementing an eye tracking system, as can also be used as a teaching text for relevant modules on advanced undergraduate and postgraduate courses.