Adelani Oyedokun AKINPELU2024-05-202024-05-202022-12Kate TurabianM.EDhttps://repository.lcu.edu.ng/handle/123456789/150The study investigated the influence of professional development programmes and workload on role performance of public senior secondary school Principals in Lagos State. Descriptive research design was adopted to guide the study, five research questions were raised while three hypotheses were tested. Population comprised all 323 public senior secondary school principals, 7,852 teachers in the 323 public senior secondary schools across the 6 educational districts in the twenty local government area of Lagos State, Nigeria. Multi-stage sampling procedure was used to sample out 323 principals and 1,800 teachers. Two self-developed instruments were developed to gather information for the study, the first was tagged ‘Principal Questionnaire on Influence of Professional Development Programmes and Workload on Senior Secondary School Principals’ Role Performance in Lagos State’ (PDPWLS). The second instrument was tagged ‘Teacher Questionnaire on Influence of Professional Development Programmes and Workload on Senior Secondary School Principals’ Role Performance in Lagos State’ (TDPWLS). Data collected were analyzed using descriptive statistics of frequency counts, simple percentages, mean and standard deviation and inferential statistics of Multiple Regression analysis (ANOVA). Result revealed a significant combined influence of professional development programmes and workload on role performance of secondary school Principals in Lagos State (F = 8.054; P < 0.05), (Adj. R2 = 0.55). Result equally revealed that when considered separately, training and workload contributes the most to role performance of senior secondary school principals in Lagos State (β =.309, t = 4.792, p < 0.05). This was followed by workshops (β = .159, t = 3.161, p < 0.05) while seminars contributes the least ((β =.033, t = .426, p < 0.05). It was concluded that there is significant influence of professional development programmes and workload on role performance of secondary school Principals in Lagos State. Among others recommendations, secondary school principals in Lagos State need to improve on their roles especially as regards supervision. This can be done by exposing principals to more training which will focus strictly on necessary roles performance and how to perform successfully. Word count: 330 Key words: Professional Development Programmes, Workload, Role performance, secondary school Principals, Lagos StateenThesis