The need for increased teacher productivity has become widely recognized, as is the fact that it depends on efficient and effective in-service training. In-service training is founded on the idea that teachers' skills must be strengthened for schools to grow. This study compares the productivity levels of teachers exposed to in-service training and those without training. A field survey was conducted among teachers in selected secondary schools in Akowonjo Education District Lagos-State, Nigeria. A simple random sampling technique was employed for this study, and questionnaires were distributed to 80 subject teachers within the selected secondary schools. Demographic profiling, descriptive statistics, Pearson product-moment correlation, and T-test statistics were used to analyze the data collected. The study's findings demonstrated that teacher productivity is determined by in-service training. The study also revealed that teachers who participate in the training program are more likel.....

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