Abstract
The study developed a scale to measure the quality of education in Oyo State secondary schools. It also determined the scale's factor structure, construct validity, and reliability. The population comprised all secondary school teachers in Oyo State, from which a sample of 630 teachers participated. Relevant items were generated from the literature and assembled after professional moderation. An instrument titled " Quality of Education Questionnaire " was used to elicit data from the teachers. Data collected were analyzed using Principal Component Analysis and other psychometric methods. The results revealed three factors: school facilities and management, students'/staff development and school policy, and students' engagement. In all, 27 items were retained using Horn's (1965) parallel analysis of the item reduction procedure. McDonald Omega and Cronbach Alpha coefficients for the final scale items were 0.78 and 0.79, respectively. The study demonstrated that the instrument possesses adequate psychometric properties that are appropriate and capable of measuring the quality of education in Oyo State secondary schools.