In-service training is an essential component of teacher professional development, which helps teachers to improve their knowledge, skills, and instructional practices. The aim of this paper was to determine the influence of in-service training of teachers on teachers’ motivation in public secondary schools in Chato District, Geita Region, Tanzania. The study used descriptive research design and targeted 140 teachers. A sample size of 103 respondents was attained through the use of Krecjie and Morgan formula. Proportionate and simple random sampling was used to select the 103 teachers while purposive sampling was used to select 6 school chairpersons. Validity was attained by consulting experts in the field of educational management while reliability was tested by pilot testing the research instruments and calculating Cronbach Alpha. A Cronbach value of 0.912 was obtained and thus the instruments was considered reliable. For interviews, the researcher ensured that data collected information did not have any minor errors. Quantitative data was analyzed using frequencies, means and standard deviations while thematic analysis was used to analyze qualitative data. there was a significant positive correlation between in-service training and teachers’ motivation in public secondary schools in Chato District, Geita Region, Tanzania was (r = .587 ; p = .000). This means that at 95% confidence level the r value for in-service training was .587 showing a moderate correlation with teachers’ motivation. The paper concluded that there was a significant positive correlation between in-service training and teachers’ motivation in public secondary schools in Chato District, Geita Region, Tanzania showing that enhanced teacher in-service programs enhances teachers’ motivation. It was recommended that policymakers and educational institutions should invest in effective in-service training programs to support the ongoing professional development of teachers Key words: In-Service; Training, Teachers, Motivation, Public Secondary Schools DOI: 10.7176/JEP/14-9-12 Publication date: March 31 st 2023
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