The objective of this paper is to contribute to the discussion and reflection of a classroom training activity as a method to improve the quality of competency-based assessment in the courses of Mathematics and "Bahasa Indonesia." The Introduction describes the theoretical perspectives and the concept of competency-based curriculum as well as competency-based assessment. It also outlines a practical example of competency-based instruction in Mathematics and "Bahasa Indonesia," as well as the structure of the new curriculum as a competency-based framework, an approach to assessment using summative or formative assessment. Furthermore, the paper explores active learning and active assessment with an example from a Bahasa Indonesia course using assessment observations and ongoing assessment as examples for competency-based assessment. Finally, the paper concludes with a detailed analysis of a method to collect evidence through analysis and compiling evidence through observation. There is a short identification analysis on participative learning and participative assessment in competency-based assessment.