Knowledge Representation & Reasoning is a fundamental topic in Artificial Intelligence. Different systems exist to help to teach this, usually focused on proofs, but anyone on formalization, which is the hardest process for students to understand in logic and AI courses. In this work we present FITS (Formalization with an Intelligent Tutor System), the first intelligent tutor to formalization teaching oriented and dedicated to both learners and teachers. At the moment the system embed three tools, the teacher's module to create exercise, the learner's module to solve them and the intelligent module which helps the teacher to design the exercises in the right way and to correct the learner’s exercises semantically. Automated reasoning systems have been used to develop the intelligent module. FITS is designed to have a web-based interface, and accessible from any browser, showing a simple attractive look.
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