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The objectives of this research were: 1) to survey the English writing problems of the undergraduate students majoring in marketing at North Bangkok University, 2) to find out the approaches to solve the problems of the English writing skills. This research was considered a mixed-methods research study. The respondents in this research were divided into two groups: 100 undergraduate students majoring in marketing of the business administration faculty at North Bangkok University in the academic year 2025, and 5 teachers in the marketing program. In this study, two research instruments were employed for the collection of data and information; namely, 1) a questionnaire for investigating problems of writing skill problems of undergraduate students majoring in marketing, and 2) a set of questions for focus group discussion meetings for the evaluation and approval of the proposed strategies for the enhancement of writing skill. The information and data collected were analyzed through statistical analysis and content analysis method and presented in terms of frequency count, percentage, mean, and standard deviation. The results and findings indicated that: 1) The problems of writing skill of undergraduate students majoring in marketing were found at the highest level, with mean scores of X = 4.31 (S.D.=0.16) X = 4.65 (0.18) while the problems of writing skill of teacher were found at the highest level, with mean scores in the range of X= 4.32 (S.D. = 0.14) - X = 4.51 (0.17), and 2) The proposed strategies for the enhancement of English writing skill of undergraduate students majoring in marketing at North Bangkok University were categorized into four chapters; namely, chapter 1: English Leamers, chapter 2: English Instructors, Chapter 3: Teaching materials for English writing, and chapter 4: English Writing Assessment. All of the 4 chapters were assessed as approval in the rage of IOC 0.66-1 meaning the constructed writing skill enhancement strategies are suitable to be guidelines of English writing skill enhancement for students majoring marketing at North Bangkok university.