The purpose of this research and development is to produce an authentic performance-based assessment instrument for Office Practice courses for student Bachelor of Office Administration EducationThe assessment instrument developed includes unique psychomotor aspects to identify various skills that should have by students. This research was used by the Research and Development model of the Borg and Gall model. Product development results are validated by experts of content and construction. The trial of the assessment instrument was conducted to the 31 Office Administration Education students at Universitas Negeri Malang. The results of the study show that this authentic assessment can improve student competency in accordance with the challenges of the 21st century because the task given replicates real-world challenges and performance standards that are usually carried out by experts or professionals in the field. Lecturers can measure the effectiveness of intellectual achievement or the ability of students to understand and think of high-level students.