Abstract
A questionnaire is conducted on 1st year students, who have almost finished the electromagnetics class. Contents of the questionnaire are composed from 122 items of quantities and laws appeared in electromagnetics. Each student judges, by himself, where is located his understanding degree on each item. The understanding degree is specified by 6 stages with practical examples. Data of questionnaire are analyzed using methods of factor analysis, cluster analysis and dual scaling. As results, it is found that items are classified into 10 factors according to easiness of understanding and familiarity of names of quantities. Also, students are classified into 6 clusters according to their carriers, records and personalities. We suggest how to raise up the understanding levels which are depending on factors and clusters. Next interviews are conducted on 4 groups consisted of few students. We asked them what teaching manners and/or methods are better for understanding lecture, and we got various answers from students who carries good records and an enthusiastic character. Considering students' answers, we suggest better lecturing styles.
