Abstract: The study investigated the Effects of Information Technology on the Achievement of Senior Secondary School Students in Essay Writing in English language. The research design is a pre and post test study, which involved 3 experimental groups and a control group. The subjects were 200 senior secondary school students, who were computer literate. They were taught by graduate English language teachers, who were computer literate. The students were taught with 3 methods of teaching namely, lecture, discussion and discussion with internet exploration. The student�s achievements in specialskills of essay writing specifically in expression, organization of ideas, contents and mechanical accuracy were determined. The study revealed that students, who were taught with discussion method combined with internet exploration performed better in expression, organization, contents and mechanical accuracy all which were regarded as overall performance. It was also discovered that students taught with discussion method performed better than those taught with lecture methods. It was recommended that language teachers should use discussion method with internet exploration to teach essay writing.