This study aims to develop, validate, and assess the usability of the LINE Pro Module for the STEM-based Linear Programming topic in Form Five Additional Mathematics. The research employs a Developmental Research Design (DRD) utilizing the ADDIE instructional model. The module's validation involved three experts specifically, three Mathematics teachers who evaluated its content. Subsequently, using purposive sampling, a total of 36 Form Five students from a school in Kuala Kangsar, Perak, were selected to assess the module's usability by completing a questionnaire. The experts' responses were analyzed using the Content Validity Index (CVI), while the module's usability was gauged by calculating the mean score. The analysis revealed a CVI value of 1.00 for both face validity and content validity, indicating satisfactory results. Additionally, the module demonstrated a high level of usability, reflected in a mean score of 3.54. In conclusion, the developed module effectively meets educational standards and aligns seamlessly with the Linear Programming topic in Form Five Additional Mathematics. This study offers crucial guidance and information to help students excel in STEM and enhance their understanding of Linear Programming.