This study provides a comparative effect study of the Computer Assisted Teaching and the 7E model of the Constructivist Learning methods on attitudes and achievements of the students in physics classes. The experiments have been carried out in a private high school in Diyarbakir/Turkey on groups of first year students whose pre-test scores of achievements and attitudes show no statistically significant difference. One of the groups received computer assisted, and the other were given instructions based on 7E model of the constructive learning method. An achievement test consisting of 29 multi-choice questions related to subject of electrostatics has been carried out to compare the group's achievements. A statistical analysis of achievement tests showed a significant difference between the students achievements at the knowledge and comprehension levels of cognitive domain (P<,05). On the other hand no difference was noted between their achievements at the application level of cognitive domain. To determine the effect of the instruction methods on the student's attitudes towards the physics course, a physics attitude scale was applied to both groups. The results have indicated that the student's attitudes towards physics learning were not affected by different instruction methods. (Contains 3 tables.)