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CAPIT: An Intelligent Tutoring System for Capitalisation and Punctuation

CAPIT: An Intelligent Tutoring System for Capitalisation and Punctuation. ICTG Group Department of Computer Science University of Canterbury. Overview. Introduction Punctuation/Capitalisation Domain Constraint-Based Modeling (CBM) CAPIT Evaluation Study Results Conclusion. Introduction.

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CAPIT: An Intelligent Tutoring System for Capitalisation and Punctuation

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  1. CAPIT: An Intelligent Tutoring System for Capitalisation and Punctuation ICTG Group Department of Computer Science University of Canterbury

  2. Overview • Introduction • Punctuation/Capitalisation Domain • Constraint-Based Modeling (CBM) • CAPIT • Evaluation Study Results • Conclusion

  3. Introduction • CAPIT is the second constraint-based ITS • Domain is English punctuation and capitalisation for school children • Basic usages of capitals, commas, full-stops, quotation marks

  4. Introduction • First evaluation of CAPIT held in April 2000 • Results indicate that children gradually learned the rules of the domain • Children much more motivated by CAPIT than by traditional pen-and-paper exercises

  5. Punctuation/Capitalisation Domain • Check-and-correct: student checks for errors, if any, and corrects them • Completion exercise: student must punctuate and capitalise an unpunctuated, uncapitalised piece of text • Latter type of exercise chosen

  6. Punctuation/Capitalisation Domain • Example: the teacher said open your books • Student submits: The teacher said, “open your books”. • Two errors!

  7. Punctuation/Capitalisation Domain • open should be capitalised • Period should be inside the quotation • Correct Answer: The teacher said, “Open your books.”

  8. Punctuation/Capitalisation Domain • Another example: theres a bee buzzing past me its taking its honey back to its hive i hope it knows its way home

  9. Constraint-Based Modelling (CBM) • SQL-Tutor is another CBM tutor • Domain knowledge represented by a set of constraints • A constraint is a pattern of form <Cr, Cs> • If a solution matches the Cr then it must also match the Cs, else something is wrong

  10. CAPIT • Designed for 10-11 year old schoolchildren • Interactive system for punctuating and capitalising text • Problems must be designed by a teacher • 45 problems and 25 constraints • Motivation: points and reward animations

  11. CAPIT • Constraints cover: Capitalisation of sentences and names Ending sentences with a full-stop Contraction of is and not Denoting ownership Direct speech etc etc

  12. CAPIT • A problem consists of a list of words • Each word has one or more tags

  13. CAPIT • Example:

  14. CAPIT • A constraint consists of a Cr and a Cs • In CAPIT, each constraint also has a feedback message • A Cs is a set of tags • A Cr is a regular expression

  15. CAPIT • Example: Cr = {NAME-OF-PERSON} Cs = ^[%SYMBOLSET%]*[A-Z0-9] Msg = Each word in a person’s name should start with a capital! • More examples in the paper

  16. Evaluation Study • April 2000 • Westburn School, Christchurch • 28 10-11 year olds working in pairs • Four 30-45 minute sessions over 1 month • Preliminary evaluation for a more comprehensive evaluation that followed in June 2000

  17. Evaluation Study • Averages per student: 89 attempts at 28 problems 30 seconds per attempt 45 minutes interaction time 21 out of 45 solved problems 7 abandoned problems 181 violated constraints, with feedback on 68

  18. Evaluation Study

  19. Conclusion • This version of CAPIT had no long-term student model • Next problem was selected randomly • Most appropriate error message also selected randomly (from set of violated constraints)

  20. Conclusion • Current version of system has Bayesian network student model. • BN built using data acquired during the April evaluation • Subsequent evaluation of that complete system held in June 2000 (see IJAIED paper)

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