The background of this research is that the implementation of the Internal Quality Assurance System (IQAS) management in private college has not been able to improve the institution because the quality culture according to Higher Education standards has not been maximized. This research generally aims to analyze, describe, and get an overview of the Internal Quality Assurance System (IQAS) in an effort to improve the performance of private tertiary institutions, specifically regarding input, process and output. This research is based on the theory of Systems, Integrated Quality Management, Policy, and Performance. This study uses a descriptive qualitative approach to the type of case study. The results of the study show that: (1) input consists of vision and mission, superior accreditation values, external party recognition, research, and community service, however international scientific paper publications are still lacking. (2) the process through the establishment, implementation, evaluation, control and improvement of IQAS standards, but the quality culture at the staff level is still lacking and the IQAS information system is not yet integrated. (3) the output produces changes to the vision and mission, the accreditation value becomes very good, increases external recognition, increases in study programs obtaining international accreditation scores, the number of research results increases, but the performance and budget of student activity programs decreases.