This study focused on the acceptability of English for Academic and Professional Purposes (EAPP) Modules as supplementary materials in teaching selected topics in English grammar through assessment and application. The respondents of this study are selected specialist of EAPP and students (ABM and STEM) who were enrolled in the subject during the time of the research.                   The assessment of the modules were done using a 4-point Likert Scale that measured the following indicators : Content, Design, Competencies to be Developed, Learning Tasks, and Assessment/Exercises. On the other hand, a pre-test/post-test was also utilized in the study that focused on evaluating the knowledge of the students with the aid of the module.                   Overall, it was found that the module, with regards to the indicators, was Highly Acceptable as rated by the specialist. Moreover, the data gathered showed that there was a significant difference between the pre-test and post-test of the respondents which proves the effectiveness of the module as a supplementary material. Additionally, it was discovered that there was a significant difference on the pre-test and post-test of the students when grouped according to strand.                   Based from the data gathered, findings, and conclusion, the researcher came up with the following recommendations : (1) Teachers of EAPP, specifically those who are teaching Concept Paper, Review Paper, and Reaction Paper Writing may utilize the current module as it was seen as acceptable. (2) English teachers may utilize the module as a supplementary material in teaching techniques in writing different kinds of papers. (3) Schools may use the current module as an alternative learning method for students specially those who may have difficulty in learning the selected topics.  (4) Curriculum developers may use the modules as a basis to progress a more effective and efficient pedagogy promoting autonomous learning for the students. (5) Future researchers may use the current study as a blueprint to further advance and develop the modular modality of learning. 

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