Feedback in an ASR-based CALL system for L2 syntax: A feasibility study

In the FASOP project, we are interested in using CALL systems to study issues in foreign language learning, particularly those related to the acquisition of spoken proficiency. Specifically, we use ASR in a CALL system that provides oral practice ex-ercises to investigate the role of corrective feedback in syntax acquisition of Dutch L2. To investigate the feasibility of this proposal we built and tested a CALL system in a pilot experi-ment. This paper analyses the accuracy of the feedback in the system, showing that it performs accurately. We also provide an overview of learner behaviour in the exercises, with a view to understanding how learners respond to feedback, and to system errors. Based on our analysis, we suggest ways of improving the feedback that might increase training effectiveness without exceeding the limits of the ASR technology. Index Terms: CALL, ASR, grammar, corrective feedbac