A User-Centred Design of a Web-based Interface to Bibliographic Databases

Chapter 8 A Prototype Web-based IR Interface Design and Evaluation 169-212
8.1 Introduction 169
8.2 Hierarchical Task Analysis (HTA) 169
8.3 An information seeking model for Web-based IR systems 180
8.4 Designing the prototype IR interface 185
8.5 Prototype heuristic evaluation 189
8.5.1 Visibility of system status 189
8.5.2 Match between system and the real world 189
8.5.3 User control and freedom 190
8.5.4 Consistency and standards 190
8.5.5 Error prevention 190
8.5.6 Recognition rather than recall 191
8.5.7 Flexibility and efficiency of use 191
8.5.8 Aesthetic and minimalist design 191
8.5.9 Help users recognise, diagnose and recover from errors 191
8.5.10 Help and documentation 192
8.6 Designing the Web-based prototype 192
8.7 Formative evaluation 195
8.7.1 Task scenarios 195
8.7.2 Results of formative evaluation 196
8.8 Summative comparative  evaluation 197
8.8.1 User background, gender and computer experience 197
8.8.2 Procedure, tasks and task completion questionnaire 198
8.8.3 Data analysis 198
8.8.4 Test hypothesis 199
8.8.5 Results of summative evaluation 200
8.8.5.1 Task completion time 200
8.8.5.2 Number of search terms used 201
8.8.5.3 Success score 201
8.8.5.4 Number of errors made 202
8.8.5.5 Subjective satisfaction with the prototype interface 203
8.8.6 Tests for statistical significance 205
8.8.6.1 The independent sample t-test 205
8.8.6.1.1 Total task completion time 205
8.8.6.1.2 Search terms used 206
8.8.6.1.3 Success score 206
8.8.6.1.4 Number of errors made 207
8.8.6.2 Mann-Whitney U-test 207
8.8.6.3 Analysis of variance (ANOVA) 208
8.8.6.3.1 Age differences 208
8.8.6.3.2 Gender differences 208
8.8.6.3.3 Online search training 208
8.8.6.3.4 Computer experience 209
8.8.6.3.5 Status of the users 209
8.8.7 Comparative analysis of results 209
8.8.7.1 Tests for statistical significance 210
8.8.7.1.1 The independent sample t-test: experienced across experiments 210
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