Development of Internal Quality Assurance Model in Higher Education Institution will provide guidelines to the achievement of organizational goals. The purpose of this article is to provide an Internal Quality Assurance Model in the Higher Education of Teacher Training and Education Singkawang (STKIP Singkawang). This paper uses a qualitative approach with multiple case study design. The data collection techniques used is interviews, observation, and documentation. There are two strategic management practices which are applied and appear in STKIP Singkawang's Internal Quality Assurance Model; (1) the existence of a factual model of STKIP Singkawang, and (2) types of innovative model decisions which are implemented in STKIP Singkawang. The research result give information about (1) System of Internal Quality Assurance of STKIP Singkawang have 30 quality standards; and (2) Model of Internal Quality Assurance have been developed is DIECU Model. DIECU Model is Deciding, Implementation, Evaluation, Check and Upgrading cycle. DIECU is model of continuous improvement for sustainable quality assurance.