In a large practical engineering class, it is difficult for the instructor to give learners additional instructions while they are doing their work. Therefore, it is useful for instructors to be able to track the responses of learners after they give instructions. To accomplish this, a click-stream visualization technique based on Web access log analysis can help instructors examine the extent to which learners have received the information they were given. In this paper, we propose an interruption-response visualization method for a large practical engineering class, using log analysis.