The lecturer allocated 1.5 hours for delivering the lecture by using provided slides about the topic and 0.5 hours for question and answer.

For providing materials for interactive internet-based group the professor's lecture was converted to an interactive electronic content. This content started with a case introduction followed with asking questions and then based on each student's answer a learning pathway would be assigned to his/her.

For providing material for computer-based group the lecture of the same professor was recorded in studio environment and was synchronized with the slides that were similar to those for lecture-based group. Then the lecture and the slides were converted to a CD as a multimedia CD.

We carried out a randomized controlled trial comparing three methods of teaching. These three instructional methods consist of face to face lecture, interactive internet based teaching and computer based teaching (lecture synchronized with presentation) regarding medical students' knowledge achievement and satisfaction.