|Title:||DeepTutor: An Intelligent Tutoring System Based on Deep Language and Discourse Processing and Advanced Tutoring Strategies|
|Principal Investigator:||Rus, Vasile||Awardee:||University of Memphis|
|Program:||Education Technology [Program Details]|
|Award Period:||3 years||Award Amount:||$1,650,272|
|Goal:||Development and Innovation||Award Number:||R305A100875|
Purpose: Encouraged by the effectiveness of one-on-one human tutoring, computer tutors that mimic human tutors have been built successfully with the hope that a computer tutor could be afforded by every child with access to a computer. The development of state-of-the-art computer tutors with natural language dialogue has been inspired primarily from studies of typical, non-expert human tutors. The proposed project will develop and test an innovative intelligent tutoring system (ITS) that intends to improve the effectiveness of state-of-the-art tutoring systems with natural language dialogue by addressing illusions of tutoring. Researchers focusing on the tutor-tutee relationship have identified a number of illusions that occur during the tutoring process, and those affecting the meta-cognitive and meta-communicative knowledge of tutors and tutees have been identified to include: illusion of grounding, illusion of feedback accuracy, illusion of discourse alignment, illusion of student mastery, and illusion of knowledge transfer. These illusions are thought to result in the tutoring process being less efficient for a number of reasons, such as: the tutor believes the tutee understands more than he really does; the tutor provides feedback that is more concerned with remaining polite than providing constructive criticism; and the student does not fully understand what tutor is saying (e.g., understand the hints). The goal of this project is to address these illusions in order to improve tutoring quality and learning. This research team believes that tutoring quality and learning will improve by penetrating these five illusions of tutoring. Researchers will develop and evaluate an ITS which will address these illusions, and which will integrate recent advances in instructional and curriculum design. Called DeepTutor, the system is intended to improve student outcomes in science relative to a current state-of-the art tutoring system, called AutoTutor, and standard classroom instruction.
Project Activities: The evaluation will focus primarily on learning gains (curriculum-based post-test scores are significantly higher than pre-test scores) as well as on usability and students' perception of the system. The effects of DeepTutor will be compared to a state-of-the-art tutoring system, AutoTutor, and to classroom instruction. Students in the two tutoring conditions, DeepTutor and AutoTutor, will undergo prerequisite mastery and pre-training periods to build needed some prior knowledge before solving problems with the tutors.
Products: Products include a fully developed DeepTutor tutoring system. Published reports of the findings will also be produced.
Setting: This study will take place in Shelby County Schools, a suburban school district surrounding Memphis, TN.
Population: Participants for this study include high school students in conceptual physics.
Intervention: DeepTutor is a dialog-based tutoring system focused on high school physics which is intended to increase the effectiveness of existing intelligent tutoring systems that hold a conversation in natural language. In particular, researchers will address the five frequent illusions mentioned above—illusion of grounding, illusion of feedback accuracy, illusion of discourse alignment, illusion of student mastery, and illusion of knowledge transfer—through a combination of deep language and discourse processing, recent advances in instructional and curriculum design, and advanced tutoring strategies. Based on technological advances, DeepTutor is expected to provide accurate assessment, better communication, and advanced tutoring and instructional strategies. With these revisions, the team expects to observe higher quality interaction between computer tutor and tutee and therefore increased effectiveness on learning gains beyond the interactivity plateau.
Research Design and Methods: The development of DeepTutor will follow an iterative systems engineering approach guided by a mixed-process software model. The team will use a mixed-model process and randomized controlled trials to evaluate the components of the system and the system as a whole. Students will be randomly assigned to participate in one of three conditions: DeepTutor, AutoTutor, or standard classroom instruction. All students will take a pretest, be exposed to one of three conditions, and then take a posttest. Information gleaned from the experimental findings will be used to revise and improve the design and implementation of the DeepTutor system.
Control condition: Students in the classroom condition will be taught the same content using a standard classroom method. Students in the AutoTutor condition will be taught the same content using the intelligent tutoring system AutoTutor.
Key Measures: DeepTutor is intended to improve student outcomes in science relative to current state of the art in ITSs. Key measures include pretests and posttests related to the DeepTutor and AutoTutor interventions. Evaluations such as the Force Concept Inventory (FCI), a widely used multiple-choice test for evaluating understanding of introductory physics and the Force and Motion Conceptual Evaluation (FCMI), which is a similar multiple-choice test to the FCI, will be used. The main dependent variables will be the pretest scores, posttest scores, and time to complete the training problems. Researchers will also use both multiple-choice and essay tests to measure learning gains.
Data analytic strategy: An analysis of variance (ANOVA) will be conducted to detect any main effect of experimental condition or interactions. An analysis of covariance (ANCOVA) will be conducted to detect any differences or interactions among conditions with the pretest as a covariate.
Publications from this project:
Graesser, A.C., and McNamara, D.S. (2011). Computational Analyses Of Multilevel Discourse Comprehension. Topics In Cognitive Science, 3 (2): 371–398.
Kopp, K.J., Britt, M., Millis, K., and Graesser, A.C. (2012). Improving the Efficiency of Dialogue in Tutoring. Learning and Instruction, 22 (5): 320–330.
Lintean, M. and Rus, V. (2011). Dissimilarity Kernels for Paraphrase Identification. In Proceedings of the 24th International Florida Artificial Intelligence Research Society Conference. Palm Beach, FL.
Lintean, M. and Rus, V. (in press). Measuring Semantic Similarity in Short Texts through Greedy Pairing and Word Semantics. Proceedings of the 25th International Florida Artificial Intelligence Research Society Conference. Marco Island, FL.
Lintean, M., Rus, V., Cai, Z., Witherspoon-Johnson, A., Graesser, A.C., and Azevedo, R. (2012). Computational aspects of the intelligent tutoring system MetaTutor. In P. McCarthy and C. Boonthum-Denecke (Eds.), Applied natural language processing: Identification, investigation, and resolution (pp. 247–260). Hershey, PA: IGI Global.
Mavrikis, M., D'Mello, S. K., Porayska-Pomsta, K., Cocea, M., and Graesser, A.C. (in press). Modeling Affect By Mining Students Interactions With Learning Environments. In Romero et al. (Eds.), Handbook of Educational Data Mining. CRC Press.
McNamara, D.S., Jackson, G.T., and Graesser, A.C. (In Press). Intelligent Tutoring and Games (Itag). In Y.K. Baek (Ed.), Gaming For Classroom-Based Learning: Digital Role-Playing As A Motivator Of Study. IGI Global.
Millis, K., Forsyth, C., Butler, H., Wallace, P., Graesser, A.C., and Halpern, D. (2011). Operation ARIES! A serious game for teaching scientific inquiry. In M. Ma, A. Oikonomou, and J. Lakhmi (Eds.), Serious games and edutainment applications (pp.169–196). London: Springer-Verlag.
Rus, V. and Niraula, N. B. (2012). Automated Detection of Local Coherence in Short Essays Based on Centering Theory, CICLing 2012: 450–461.
Rus, V., and Lintean, M. (in press). A comparison of Greedy and Optimal Assessment of Natural Language Student Input Using Word-to-Word Similarity Metrics. Proceedings of the 11th International Conference on Intelligent Tutoring Systems. Chania, Crete, Greece.
Rus, V., Lintean, M., Graesser, A.C., and McNamara, D.S. (2012). Text-To-Text Similarity Of Statements. In P. McCarthy and C. Boonthum-Denecke (Eds.), Applied Natural Language Processing: Identification, Investigation, and Resolution (pp. 110–121). Hershey, PA: IGI Global.
Storey, J. K., Kopp, K.J., Wiemer, K., Chipman, P., and Graesser, A.C. (in press). Using AutoTutor to teach scientific critical thinking skills. Behavior Research Methods.
Sullins, J., Craig, S.D., and Graesser, A.C. (in press). The Influence Of Modality Of Deep Reasoning Questions. International Journal of Learning Technology, 5: 378–387.