Purpose: The research focused on establishing the influence of principals' social support strategies on various aspects of teacher performance in public secondary schools in Mumias East Sub-County, Kenya.
Methodology: It utilized both qualitative and quantitative data in a mixed research methodology. Also, the data was obtained from various population parameters comprising 1 sub-county director of education (SCDE), 1 quality assurance sub-county officer (QASO), 27 principals, 237 teachers, and 3730 students. The data regarding each variable was obtained from each population parameter, hence a cross-sectional descriptive study design. The independent variables comprised the frequency of in-service training and guiding and counseling programs. On the other hand, the dependent variables comprised lesson attendance and recovery, mean grades achieved, and score on teacher appraisal. To gather data about the variables, there were interviews with principals, QASO, and SCDE, questionnaires for students and teachers, and secondary data about performance in Kenya certificate of Secondary education (KCSE). The data was analyzed thematically based on the study objectives. Only means, percentages, and standard deviations were utilized to organize data. Also, the linear regression model was used on the data to find out the relation between independent and dependent variables.
Findings: It was discovered from the data analysis that in-service training impacted teacher performance, while guidance and counseling did not impact the teacher's performance. However, from the general perspective of the principal's teacher social support strategies, the data revealed little correlation with teacher performance.
Recommendations: The study recommend that there should be consistent in-service training in schools and selective guidance and counseling especially to teachers who show extreme social maladjustments. However, it is necessary that similar research be conducted especially on the influence of principal’s strategies to guiding and counseling teachers and the impacts on teacher performance.