The study investigated supervisory approaches employed as means of ensuring quality control in the secondary education system. Survey research design of ex- post- facto type was used in carrying out the study. Stratified random sampling procedure was used to select 250 participants from the population of 9,000 teachers in Ibadan Municipality. A self-constructed questionnaire tagged ‘Supervisory Approaches Scale’ (SAS) was used to elicit relevant data from the respondents. Test- retest method of reliability yielded a coefficient of .78. The data collected were analyzed using descriptive statistics and One Way Analysis of Variance. The findings revealed that classroom observation approach was the most frequently used supervisory approach with the highest mean of 2.7 while majority of the participants also preferred classroom visitation and observation as the most effective supervisory approach [F (2, 247) =8.900 P<0.05] The study recommended amongst other things that classroom visitation and observation should be employed in the supervisory activities.