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This study compares and examines the relative effectiveness of workbook-based and computer-based exercises on improving the correct use of grammar, perfect aspect and conditionals, in writing. Considering the limited average class time available for students, self-study for grammar acquisition can be recommended including the use of computer-based language learning tools that can be one of the methods of self-study. Computer-based grammar and writing exercises could partially replace the role of language teachers by providing individualized and instant feedback that normally would have been provided by the instructor. The participants in this study consisted of 37 Korean college students. This study took 14 weeks to conduct classroom exercises and collect the data, which utilized diagnostic tests, pre-tests, and post-tests. The analyzed test results showed that the two grammar forms were significantly different in controlled production and free production in accuracy for the use of computers. The overall findings of this study suggest that the integrated study of grammar and writing can be effective in establishing a solid foundation for English writing, and that CALL courseware showed the different types of feedback by enhancing for efficiency of utilizing grammar learning to improve writing skills. However, the effect of using CALL courseware varies depending on the grammar forms.
