How should the Reading Tutorevaluate learning?

Evaluation should be



• Ecologically valid -- based on normal system use
• Authentic -- student chooses material
• Unobtrusive -- invisible to student
• Automatic -- objective, cheap
• Fast -- computable in real-time on PC
• Robust -- to student, recognizer, and tutor behavior
• Data-rich -- based on many observations
• Sensitive -- detect subtle effects

So estimate improvement in assisted performance

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