DEVELOPMENT OF A STEM LESSON EVALUATION SCALE FOR SECONDARY EDUCATION IN VIETNAM

Abstract

The lesson evaluation scale is an essential tool that supports teachers in analyzing and assessing lessons during professional development activities, contributing to the advancement of teachers’ competencies. For STEM lessons, which are characterized by interdisciplinary integration, the use of a suitable evaluation tool is crucial. This paper presents the process of developing a STEM lesson evaluation scale and examines its reliability in assessing STEM lessons at secondary schools in Vietnam. The scale was developed based on theoretical research on STEM lessons, guidelines for implementing STEM education, professional development activities, lesson planning, and the practice of lesson evaluation in Vietnamese secondary schools. The development process includes gathering feedback from teachers regarding the unambiguity, clarity, and ease of understanding of the criteria and levels. The scale was then validated for reliability using Cronbach’s Alpha and consensus level through the Intraclass Correlation Coefficient (ICC). The experiment involved 79 teachers who independently used the scale to evaluate three STEM lesson videos. The analysis results showed that the scale demonstrated high reliability (Cronbach’s Alpha coefficients were all above 0.8 and one group at 0.675) and strong consensus (ICC coefficients above 0.8).