Conceptual Graphs Self-tutoring System

The present paper describes a self-tutoring system CG-EST (Conceptual Graphs Elearning Self-Tutoring system). The purpose of this system is to generate questions to the user from given text lessons, to process user answers and to check their correctness. CG-EST includes modules for: parsing and producing logical forms (LF); generating conceptual graphs (CG) based on LF; generating questions based on LF; defining the scope of correct answer using CG operations; matching the user’s and correct answers. This approach assists the automatic eLearning systems being developed for various domains with some requirements: all sentences in the lessons have to use Controlled English (CE); to each lesson a simple concept type hierarchy and a synonyms set have to be attached. However these restrictions are useful for semantic interpretation of Natural Language (NL) texts. Thus CG-EST presents a solution for self-service eLearning that is ideal for training in a specific field.

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