Page 26 -

Contents xix

14.4.3 Other issues 446
14.4.4 Data collection and analysis 446
1 4.5 Predictive models 448
1 4.5.1 The WMS model 449
1 4.5.2 The Keystroke level model 450
14.5.3 Benefits and limitations of WMS 453
14.5.4 Fitts' Law 454
Interview with Ben Shneiderman 457

Chapter 15 Design and evaluation in the real world: communicators
and advisory systems 461
15.1 Introduction 461
15.2 Key Issues 462
15.3 Designing mobile communicators 463
15.3.1 Background 463
15.3.2 Nokia's approach to developing a communicator 464
15.3.3 Philip's approach to designing a communicator for children
474
15.4 Redesigning part of a large interactive phone-based response system 482
1 5.4.1 Background 483
15.4.2 The redesign 483

Reflections from the Authors 491

References 493

Credits 503

Index 509