AbstractThis study aimed to develop and determine the usability of the MyBioProject teaching module, which uses the Project-Based Learning (PjBL) approach for four selected topics within the Form Four KSSM biology syllabus in Malaysia. This study employed a quantitative approach with a developmental design. The module was developed using the ADDIE Model and encompassed five phases: analysis, design, development, implementation, and evaluation. The instruments used in this study were the expert validation form for the MyBioProject module, the expert validation form for the usability questionnaire, and the usability questionnaire. The module's face and content validity were assessed through expert agreement percentages and the Content Validity Index (CVI) values. The findings indicate that the module has excellent face and content validity, with an average expert agreement percentage of 92.2% for face validity and 100% for content validity, achieving I-CVI and S-CVI values of 1.00. The reliabili.....