<![CDATA[Purpose: This community service activity aims to strengthen the ability of elementary school teachers to recognize, access, use, select, and utilize PhET Interactive Simulations as a virtual laboratory to support science learning.Research Methodology: The activity was conducted at SD Inpres 3 Tondo Palu using a participatory, practice-based training approach ("learning by doing") that included presentations, demonstrations, guided practice, discussions, reflection, and the development of sample learning activities. The activity's outcomes were evaluated using a 20-item assessment administered before and after the training, covering four competency aspects. A total of 16 teachers participated in the evaluation.Results: The mean achievement increased from 70.63% before training to 87.50% after training, representing a 16.88-percentage-point increase. The largest improvement occurred in the ability to use PhET, with an increase of 23.75 percentage points. Thirteen participants improved, two remained unchanged, and one decreased by one point.Conclusions: Practice-based training helps strengthen teachers' mastery of the use of PhET, especially the ability to operate simulations and choose simulations according to learning needs.Limitations: Evaluation of the activity was limited to participants at one school and did not monitor consistent use of PhET after the activity.Contributions: The activity provides training and mentoring experiences that can be a reference for elementary schools that need virtual laboratory alternatives to support science learning.]]>
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