Abstract

This study investigated the relationship between teachers' professional development indices specifically professional association membership, peer group interaction, and mentorship practices and the academic achievement of Business Education students in Colleges of Education in North-East Nigeria. Anchored in Vygotsky's (1978) Zone of Proximal Development (ZPD) theory and the Social Learning Theory of Bandura (1977), the study adopted a correlational survey research design. A sample of 320 Business Education lecturers drawn from six Colleges of Education in North-East Nigeria was selected through stratified random sampling. Data were collected using a validated, researcher-designed questionnaire “the Teachers' Professional Development and Students' Academic Achievement Inventory (TPDAAI)” with a Cronbach's alpha reliability coefficient of 0.87. Descriptive statistics (mean and standard deviation) and inferential statistics (Pearson product-moment correlation and multiple linear regression) were employed for analysis at a 0.05 significance level. Findings revealed statistically significant positive relationships between professional association membership (r = 0.623, p < .001), peer group interaction (r = 0.587, p < .001), and mentorship practices (r = 0.641, p < .001) with students' academic achievement. Multiple regression analysis confirmed that the three predictors jointly accounted for 51.0% of the variance in academic achievement (R² = 0.510, F(3, 316) = 109.67, p < .001). The study concluded that sustained investment in teachers' professional development significantly enhances student academic outcomes. Recommendations include policy-level mandates for professional association affiliation, structured peer learning communities, and institutionalised mentorship frameworks in Nigerian Colleges of Education.