In accordance with expository teaching, the aim of the research is to determine the effects of five different e-learning types on student achievement. In order to accomplish this, five different e-learning designs dealing with the same subject were formed within the scope of expository teaching. These designs include two synchronous (Instructor-led, Telementoring and E-coaching) and three asynchronous (Learner-led, Facilitated, Embedded) types of e-learning. The designs were carried out with 250 first-year university students attending the course Computer II (Database), distributed to five different groups. The participants were asked to compile a multiple choice achievement test with 40 items. The findings of the study showed that there were significant differences among groups in terms of student achievement. Instructorled e-learning groups were more successful than other groups. Differences among the students’ achievements were discussed based on the “synchronous instructor effect”.

Keywords: Types of e-learning, achievement, Expository teaching method