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AbstractThe study was to test the effectiveness of Web-Based Interactive Blended Learning (WBIBL) model for subjects in the Department of Electrical Engineering, Padang State University. The design employed was a quasi-experimental design with one group pretest-posttest administered to a group of 30 students twice. The effectiveness of WBIBL model was tested by comparing the average pretest scores and the average posttest scores, both in the first trial and the second trial. The average pretest and posttest scores in the first trial were 14.13 and 33.80 subsequently. The increase in the average score was significant at alpha 0.05. The average pretest and posttest scores in the second trial were 18.67 and 47.03. The result was also significant at alpha 0.05. The effectiveness of WBIBL model in the second trial was higher than that in the first test. The result was not entirely satisfactory and it might be caused by several weaknesses in both tests, including the limited number of sessions, being only one subject, and the limited number of students as the subjects. However, it could be concluded that the WBIBL model might be implemented as an alternative to the face-to-face instruction.