Enhancing Knowledge Tracing with Concept Map and Response Disentanglement
This work addresses the need for more accurate student knowledge tracing in educational technology, offering actionable feedback to improve learning experiences, though it is incremental as it builds on existing KT methods.
The paper tackled the problem of conventional knowledge tracing models overlooking answer choices in multiple-choice questions by proposing CRKT, which leverages answer choices and concept maps to distinguish responses and track knowledge states, achieving superior performance in prediction accuracy and interpretability over state-of-the-art models.
In the rapidly advancing realm of educational technology, it becomes critical to accurately trace and understand student knowledge states. Conventional Knowledge Tracing (KT) models have mainly focused on binary responses (i.e., correct and incorrect answers) to questions. Unfortunately, they largely overlook the essential information in students' actual answer choices, particularly for Multiple Choice Questions (MCQs), which could help reveal each learner's misconceptions or knowledge gaps. To tackle these challenges, we propose the Concept map-driven Response disentanglement method for enhancing Knowledge Tracing (CRKT) model. CRKT benefits KT by directly leveraging answer choices--beyond merely identifying correct or incorrect answers--to distinguish responses with different incorrect choices. We further introduce the novel use of unchosen responses by employing disentangled representations to get insights from options not selected by students. Additionally, CRKT tracks the student's knowledge state at the concept level and encodes the concept map, representing the relationships between them, to better predict unseen concepts. This approach is expected to provide actionable feedback, improving the learning experience. Our comprehensive experiments across multiple datasets demonstrate CRKT's effectiveness, achieving superior performance in prediction accuracy and interpretability over state-of-the-art models.