MODEL-BASED EVALUATION
David E. Kieras · 2007
Model-Based Evaluation Technique . . . . . . . . . . . . . 1200 Creating the Simulated Device . . . . . . . . . . . . . . . . . . 1200 How to simplify the simulated device . . . . . . . . . 1201 Identifying the Task Strategy . . . . . . . . . . . . . . . . . . . 1202 A task analysis does not necessarily specify a task strategy . . . . . . . . . . . . . . . . . . . . . . 1202 Difficulties in identifying task strategy . . . . . . . . . 1202 A heuristic: Model what users should do . . . . . . 1202 Concerns Over Model Validity . . . . . . . . . . . . . . . . . . 1203 Can you believe the model? . . . . . . . . . . . . . . . . . 1203 Should you validate the model? . . . . . . . . . . . . . . 1203 Summary: Assessing model validity . . . . . . . . . . . 1204 GOMS Models: A Ready-to-Use Approach . . . . . . . . 1204 Why GOMS Models Work . . . . . . . . . . . . . . . . . . . . . . 1205 Limitations of GOMS Models . . . . . . . . . . . . . . . . . . . 1206 Concluding Recommendations . . . . . . . . . . . . . . . . . 1206 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1206 Model-based evaluation is using a model of how a human would use a proposed system to obtain predicted usability measures by calculation or simulation. These predictions can replace or supplement empirical measurements obtained by user testing. In addition, the content of the model itself conveys useful information about the relationship between the user’s task and the system design.