This study aims to design and develop an educational website _HeatMinds_ for the topic of heat and determine its usability among Form 4 physics students in Puchong. This developmental research design study was developed based on the ADDIE instructional design model. HeatMinds was validated through Face and Content validity by three experts. The research sample was chosen through cluster random sampling where one class was chosen. This research is categorised under the quantitative method with qualitative data since a questionnaire and interview were carried out to determine HeatMinds_ validity. Moreover, the Technology Acceptance Model (TAM) was adapted as an instrument to determine the acceptance of HeatMinds through the survey. Then, the data was analysed using descriptive statistics of mean and standard deviation. The data from three experts showed that HeatMinds had a good face and content validity of 96.7% and 89.4%. Heatminds has received a high level of approval for perceived us.....

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