The results of previous studies show that mini research learning can improve student competence but there are problems in the assessment process where lecturers have not used appropriate instruments and the instruments used have not comprehensively assessed students' cognitive, affective and psychomotor aspects. Based on these problems, we carry out research on the development of an authentic assessment based on mini research. Methods that use are Research and Development (R&D) with the ADDIE model, analysis, design, development, implementation, and evaluation. The purpose of the research is to produce a mini research-based assessment that can be used by lecturers to conduct authentic assessments to measure student competence comprehensive during the learning process. The results of the expert validation test obtained an average construct validation score of 3.5 (valid), an average content validity score of 3.7 (valid). The results of testing the validity of the instrument using Kaiser-Meyer-Olkin (KMO) on cognitive assessment of 0.79 > 0.5, psychomotor assessment 0.618> 0.5, affective assessment 0.555> 0.5, so it can be concluded that the three types of instruments are valid. The result of the reliability test using Crocbach's alpha was 0.7 in the high category. The results of the first test student's competency assessment showed that 56% of students were at the competent level in cognitive competence, 80% of students were at the competent level in psychomotor competence and 83% of students were at the competent level in affective competence. The mini research-based assessment that was developed is appropriate to be used in the learning process to measure student competences