[en] The demand for education of college students on radiation protection is strongly emphasized recently in Japan. We here aimed at developing an effective way to teach the radiation protection-related laws to students who have so little practical experience in radiation protection that the learning motivation tends to be very low, and a high training effectiveness is hardly expected. For this purpose, we tested a combination of an ordinary classroom lecture and a group work in which the students positively and cooperatively tackled the specific task that was given by the lecturer. The tasks included such as making up an application form to be submitted to Nuclear Regulatory Agency to respond to an altered condition of utilization of a radiation source in a radiation-controlled area. The students had to investigate and solve what is necessary to comply with the law by themselves. As a result, it was suggested that the group work had an effect on improvement of learning motivation of the students. (author)