This study was conducted to determine the assessment essentials of problem-based learning in improving physics learning result of the second basic physics course. Research and development method were used by following the stages of development research according to Brog and Gall. Retrieval of data in this development research is using small group tests and large groups test and also response questionnaires. The average percentage of the assessment process in the small group and large group test obtained 90.38% and 84.01% and the results of the responses of students in the small group and large groups were obtained 96.6% and 99%. Product development results are at 81% 100% of feasibility level. The assessment process of second basic physics course needs to be improved as an integral part of the learning process in accordance with the characteristics of learners.

Keywords : Problem-Based Learning; Assessment; Research and Development.