ocr: User's Goal Stack: Thousands Hundreds Tens Units WRITE TOTAL ADD COLUMN - - - I - Carry 2 - - 5 - - 4 Number 1 Goal Desired Stack: Behavior 7 - - - 7 - - - 2 Number: 2 WRITE TOTAL ADD COLUMN - - - I - - 9 TOTAL Desired Behavior Facts: 42-6 Figure 2: User-interface for Intelligent Tutor for multi-column addition. The left-hand side panel provides a real-world environment for solving the problem. Entries are made by selecting boxed fields with a mouse and typing an entry. The right-hand panel reinforces the students behavior by displaying the students goal stack. When the student makes a mistake ...
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