Assessment is one of the learning processes used to see the success of learning. If the assessment system is right, then the data obtained will describe the actual learning outcomes. The purpose of this research is to produce an authentic assessment model that can be used as an assessment guide for research methods courses. The assessment model in question contains authentic tasks that can lead students to apply theory to structured research ideas in a good research proposal design. This assessment model consists of 5 aspects which have translated into 17 sub-aspects with 43 assessment items. This research uses design research with the type of development study. The stages carried out are in the form of preliminary and formative evaluations which include self-evaluation, prototyping, and field tests. The subjects in this study were students who took research methods courses as many as 65 people. The results of the study indicate that the assessment model developed has valid characteristics based on the validator's assessment.