During the last 10 years, use of the Word - wide-web for educational purposes has increased dramatically.However.very little empirical research has been carried out to determine the effectiveness of this use.The aim of this study was therefore to investigate the effectiveness of using the Word - wide-web on an EAP writing course. Two groups of students were taught writing by two different methods: one group was taught by a teacher in a traditional classroom. while a second group included use of an on-line web-site in their course. The two groups were assessed in the same way after a twelve-week period of instruction. Results of the assessment showed significant differences between the two groups.the group that used the on-line web-side performing much better on all aspects of the test. This suggests that the use of computer sddisted learning programmes for at least some of the teaching time available can be recommended for EAP writing courses