This research aims to determine strategies for developing 4C teacher skills in improving the quality of learning services at SMA Yuppentek 1 Kota Tangerang. This research uses a qualitative approach with a descriptive method. Data collection was carried out through interviews, observations, and documentation studies. The data that has been collected is analyzed through data reduction, data presentation, and drawing conclusions. To test the validity of the data used credibility of the data by triangulation of sources, techniques, sources, transferability, dependability, and confirmability. The results of the research show that (1) Planning is carried out by analyzing needs based on school resources, setting teacher qualifications and competency standards, maximizing competence or excellence possessed, and distributing human resources; (2) Strategy implementation is carried out by carrying out several activities consisting of IHT (In House Training), Community of Practitioners, MGMP, workshops, and comparative studies; (3) Factors supporting the implementation of the strategy are the school's status as a driving school, the availability of adequate facilities and infrastructure, and having teachers who have the potential to improve school quality. The inhibiting factor is that it is difficult to change the mindset of senior teachers due to a lack of understanding of the 4C skills.