<![CDATA[In the field of education, the 21st century is known as the digital era, where all sectors, including education, must be digitized, and where technology plays a fundamental role in education. The purpose of this study was to determine the effect of the Trello application-based training and mentoring method for elementary school teachers. This research is a quantitative descriptive study with a one-group pretest-posttest research design. The sample in this study were teachers in Ngawi Regency, East Java Province. The data collection technique used is a test. Data were analyzed using N-Gain. The results showed an increase in teacher knowledge about the Trello application. The pre-test showed an average score of 45.0 while the post-test showed an increase with an average score of 75.7. Therefore, it is important for teachers to improve their skills in developing Trello-based portfolio assessments]]>
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