The objectives of this study were to: 1) develop a causal relationship model of school effectiveness on social outcomes in secondary schools, 2) examine the congruence between the development of the causal relationship model of school effectiveness and the empirical data, and 3) study the direct, indirect and total influential factors of the causal relationship model of school effectiveness on social outcomes in secondary schools. This research used mixed methods research which consisted of 2 phases: Phase 1; the research conceptual framework was built in the first phase by conducting an analysis of relevant documents and research and interviewing 54 administrators, teachers and students from large, medium and small secondary schools. Phase 2; the research hypothesis was verified by using the data collected from a 5-level rating scale questionnaire with an overall reliability value of 0. 98. The sample consisted of 502 administrators and teachers from 108 secondary schools under Secondary Educational Service Area Office in the academic year 2022 and was selected by multi-stage random sampling. Data analysis was conducted by determining: frequency, percentage, mean, standard deviation, skewness, kurtosis, Pearsons product moment correlation coefficient, first order confirmatory factor analysis and structural equation model analysis.
