The Effect of Differentiated Instruction on the Academic Achievement and Opinions of 3rd-Grade Students in Science Education: A Mixed-Methods Study.

The purpose of the current study is to determine the effect of the differentiated instruction approach on 3rd-grade primary school students' academic achievement (N = 45) in the "Electrical Devices and Tools" unit and to explore their opinions regarding the differentiated instruction process. In this context, the content of the lessons prepared using student-centred approaches on students' science achievement was examined, and students' opinions on the differentiated instruction approach were also evaluated. The study was conducted in the spring term of the 2024-2025 school year in a major city located in the central region of Türkiye, and a mixed research design combining both quantitative and qualitative approaches was employed. In the current study, during the instructional process of the experimental group, differentiated instruction lesson plans available on the Education Information Network (EIN) portal provided by the Ministry of National Education (MoNE) were used. In the control group, the process outlined by the current curriculum was followed. When the findings were evaluated, statistically significant differences were found in favour of the experimental group, in which activities were implemented based on the differentiated instruction plan, compared to the control group that received instruction within the framework of the current curriculum. In addition, students' opinions regarding the process indicated that the implementation contributed positively to their learning. In light of the findings obtained, recommendations were made for future research.