Abstract
In this paper, we propose a system for assisting teachers with making effective comments from descriptive answers of a quiz. The system provides a summary of answers that helps teachers to identify the level of learners' comprehension. Teachers would make effective comments by the summary without reading all answers. Especially, we aim to shorten a time that learners wait for comments after their submissions. The longer the time is, the worse learners understand. We improve our previous system that classifies answers and visualizes the result based on SOM. Our new system provides an incremental SOM map that is updated with progress of submissions. Teachers can make a guess about major contents of answers even during submission. When all learners finish their answer, a teacher can make effective comments immediately.
