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Circuit Tutor® : Prototype of a Mobile Web-based Intelligent Tutoring System

Circuit Tutor® : Prototype of a Mobile Web-based Intelligent Tutoring System. Intelligent Systems Application Center (ISAC). Brian Butz and Tochi Nwachukwu. Tochi Nwachukwu. Intelligent Tutoring Systems. An Intelligent Tutoring System (ITS) is any computer system that delivers:

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Circuit Tutor® : Prototype of a Mobile Web-based Intelligent Tutoring System

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  1. Circuit Tutor®:Prototype of a Mobile Web-based Intelligent Tutoring System Intelligent Systems Application Center (ISAC) Brian Butz and TochiNwachukwu Tochi Nwachukwu

  2. Intelligent Tutoring Systems An Intelligent Tutoring System (ITS) is any computer system that delivers: • direct customized direction • instruction and feedback to the user • without the involvement of an actual person

  3. Mobile Interface vs. Desktop Interface

  4. Design Questions • “Does shorter, yet more frequent use of mobile tutors provide equivalent learning gains compared to longer, yet less frequent, desktop tutor use?” • “What types of problems are best suited for short and frequent tutor use?” • “Are the learning gains of the mobile tutor equal to those of the desktop tutor?” • “Should the ITS app be web-based or native?”

  5. Circuit Tutor® • Objective • develop the prototype of a mobile web-based intelligent tutoring system (called Circuit Tutor) • Design • using client-side and server-side scripting tools – HTML5, DHTML, XML, CSS, JavaScript (handles mathematical computation), PHP (dynamically generated web pages) and Lectora® (Authoring tool). • Device • iPad® running iOS4.3 or better • Also runs on iPhone 4 and above

  6. Subsystems

  7. Main Modules • Processing power: Desktop devices > Mobile devices • Circuit Tutor® will be designed to accommodate that limitation. • Therefore, NO complex architecture with numerous modules • Three main units/modules that constantly interact with each other: • The Curriculum Unit • The Problem Unit • The Strategy/Execution Unit

  8. Curriculum Unit • Each section covers a different area of the undergraduate electrical engineering curriculum (e.g. Equivalent Resistance, Ohm’s Law, Kirchhoff’s Laws [KVL & KCL]) • Every section and subsection consists of different learning objectives

  9. Problem Unit • This includes questions, answers, and the appropriate knowledge components necessary to solve the questions. • Problems include: • In-chapter problems (Hints, Feedback etc) • End-of-chapter problems (Knowledge Assessment) • Example problems

  10. Problem Unit • The use of Brown’s Hierarchical Design method to present problems: • Makes it easy for the ITS to identify the user’s problem area • Determine what next course of action to take • Computerized Adaptive Testing (CAT) Method for difficulty level adjustment

  11. Brown’s Hierarchical Design Method • Information is presented to the users: • are organized in a tree-like fashion, • grouping natural problem solving steps together on one screen, • thereby allowing the user to answer questions in a sequenced fashion.

  12. KVL Sample Problem • What is the voltage across R1? • Every section and subsection consists of different learning objectives: • First, find the equivalent resistance for R3 and R4? [Learning Objective I] • Next, determine the KVL equation around the closed circuit. [Learning Objective II] • Finally, solve for the voltage across R1. [Learning Objective III]

  13. Strategy/Execution Unit • The strategy unit consists of tutor strategies and the agenda. Different tutor strategies can make a single problem behave in different fashions. • This unit will allow for the high-level control of problems and the provision of flow control between problems

  14. Guidelines for Mobile ITS Design

  15. Guidelines for Mobile ITS Design

  16. User Session (Username)

  17. Initial Difficulty Level

  18. Pre-Assessment Test

  19. Pre-Assessment Test

  20. Student Placement

  21. Learning Stage (Hints)

  22. End of Learning Stage

  23. Student Knowledge Validation • Two methods are adopted in the prototype assessment test: • Hierarchical Design Method (Pinpoint problem area based on Learning Objectives) • Computerized Adaptive Testing (CAT) Method • Some of the CAT Models examined: GRE, GMAT, NAPLEX (Pharmacy Test), Linacre’s Dichotomous CAT Test Model

  24. Prototype ITS Assessment Test • Three difficulty levels: Easy, Medium, Difficult • Each question in the test has a difficulty level and learning objective associated with it (L1D1, L2D2 etc.) • Starts with Easy difficulty level • Difficulty level increases only after a set of questions are answered correctly • Eventually the prototype ITS test will stay at a certain difficulty level

  25. Assessment Test Screen

  26. Assessment Test Screen

  27. Difficulty Increase

  28. Detailed Score Report

  29. Detailed Score Report

  30. Score Interpretation

  31. Circuit Tutor Set-up and Interface • Ad-hoc or FTP connection: • Enter the web link into the mobile browser • The IP address of the server hosting the application is entered as the web address.

  32. Circuit Tutor Set-up and Interface • Add to home screen:

  33. Circuit Tutor Set-up and Interface • Icon added to homepage

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