The NTC (Nikola Tesla Center) system of learning is an activity program designed to promote the development of motor skills and cognitive abilities in preschool and school-age children. This research aims to investigate the activity-based learning process prepared by NTC system of learning approach. In this qualitative research, case study design was used. The research group consisted of 34 fourth-grade students and four female teachers from a public primary school in the 2018-2019 academic year. Data were collected by using semi-structured interview and observation techniques. The research data was collected after 12 lessons on eight Flags. In the social studies course, themed activities based on the NTC system of learning approach were prepared by the researchers. Descriptive analysis method was used to analyse semi-structured interviews with teachers, and the content analysis method to analyse semi-structured interviews with students. According to research results, students described the flag-country matching, classifying flags according to their characteristics, learning colours, shapes, and emblems on the flag, and learning the capitals and national anthems of the countries as activities they liked. Research suggestions include implementing them at different levels of education and structuring them mainly for musical and motor skills development.