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This study aims to investigate developing writing through organizing English learning activities for communication with B – SLIM Model. The sample of this study was purposively selected from 35 of first year students in English for International Communication major, Rajamangala University of Technology Tawan-ok in Integrated Skills in the English Language course of 2021 academic year. The research instruments consisted of an essay writing assignment of at least 500 words, a form for writing error record, students' satisfaction with B-Slim Model learning activities and focus group activity to identify the causes of errors. The results based on the writing errors indicated errors before taking course including subject-verb agreement (33.10%), sentence boundaries (30.31%), and clause boundaries (36.59%) and after finishing course as follows: subject-verb agreement (9.82%), sentence boundaries (30.36%), and clause boundaries (59.82%). The efficiency of the English learning management based on B-SLIM Model was 73.45/80.32, which was higher than the criteria set at 70/70. The ability of English writing after learning using B-SLIM Model was better than writing without applying B-SLIM Model. The satisfaction the students taught by B – SLIM Model was most satisfied at (x) = 4.63 (S.D=1.44). Errors committed in English writing were mainly caused by L1 interference and limited knowledge of English structure.
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