Computer Literacy is one of the complementary subjects required for all first-year students in Hong Kong Baptist University. This subject covers both general computer knowledge and selected software packages. In addition to lectures, laboratories are arranged for students to gain hands-on experience with software operations. However, no assignment or tutorial is assigned for the part of general computer knowledge. Due to large class size, traditional paper-and-pencil assignment may not be appropriate. Hence, a multimedia web-based assessment system was developed. This system provides assignments on general computer knowledge. Students can access this system via the World Wide Web. In this paper, we present our findings on students' behaviour, performance and perception in the use of this assessment system. [Copyright of Innovations in Education & Teaching International is the property of Routledge. Full article may be available at the publisher's website: http://dx.doi.org/10.1080/14703290110074542]