Abstract
This research aims to produce an authentic assessment for fundamental forehand and backhand groundstroke techniques, using the actions method of learning outcomes in tennis courses, for students at Yogyakarta State University's (FIK UNY) Faculty of Sports and Health Sciences. This study employed development research with a 4D model (Define, Design, Development, and Disseminate). This research was implemented through the preliminary research stage, designing assessment instruments, and validating the instrument model developed. In this study, 30 students were chosen to sample using a purposive sampling strategy, with 5 experts serving as validators. Data was collected through questionnaires and expert validation with the Delphi technique. The collected data is analyzed and concluded. Based on the analysis of the collected data, it can be concluded that authentic assessment instruments of fundamental forehand and backhand groundstrokes techniques using the Actions Method are needed to evaluate the learning objectives of tennis courses for students at FIK UNY. This assessment model can be used to evaluate the learning outcomes of tennis courses for FIK UNY students. It makes it easy for lecturers to evaluate students' learning outcomes authentically, has excellent validity, and has a high rater reliability coefficient.