Influence of Differentiated Instructional Techniques on Learning Achievement in Secondary Schools in Nairobi County, Kenya: A Focus on Approved Business Studies Textbooks.

Abstract:

This study examined the significance of differentiated techniques in accelerating learning achievement in business studies among Form Three learners in public secondary schools in Nairobi County, Kenya. Triggered by persistent decrease in learner mean score in accounting concepts in summative exams covered at Form Three, the study investigated whether Business Studies textbooks employing varied instructional strategies contribute to improved academic outcomes. Anchored on Vygotsky’s Zone of Proximal Development and guided by positivism philosophical underpinning, the study utilized mixed methods approach incorporating the Solomon four-group experimental design to control pretest sensitization effects. A total of 200 learners were sampled using stratified random and purposive sampling techniques. Quantitative data were analyzed using descriptive statistics, t-tests, chi-square tests, and linear regression models. Descriptive findings revealed that learners perceived differentiated instructional elements such as varied teaching approaches, alternative assignments, and responsive learning materials as beneficial for mastering concepts and boosting engagement. Regression analysis indicated a significant positive relationship between differentiated techniques and learner achievement in the experimental group (R² = 0.396, β = 0.217, p < .001), while no significant relationship was observed in the control group (β = -0.141, p = 0.629). The findings depicted that effective textbook design incorporating differentiated techniques enhances learner motivation and academic success. However, in the absence of intervention, these techniques alone were insufficient to yield significant learning gains. The study recommends that the Kenya Institute of Curriculum Development (KICD) embed differentiated strategies within textbook guidelines and support teacher training to ensure effective classroom implementation of these strategies.