ERROR DIAGNOSIS IN A TUTORING SYSTEM FOR THE CONJUGATION AND SPELLINGOF DUTCH VERBS

A flexible knowledge-based tutoring system for the conjugation and spe lling of Dutch verbs is described. The program, called Het Spelraam, i s intended to communicate procedural knowledge about the spelling of v erb forms to students with elementary spelling knowledge. The student has to fill in gapped sentences. If an incorrect answer is entered, th e system locates the point where the student deviated from the path th rough the spelling algorithm that is leading to the correct answer Fro m that particular point the student is guided through the spelling alg orithm. The error diagnosis techniques applied are described in detail . Het Spelraam is a commercial product which is used in both schools a nd language-training institutes. Results from initial evaluations are promising.