A major factor affecting students’ academic performance is the classroom environment, in which class size plays an important role. This study aims to test the impact of class-size reduction on students’ performance and examine other factors affecting it. The results are established using a simple model that determines the impact of class size, individuals’ earnestness toward studying, and individuals’ learning environments on students’ performance. The results reveal the benefits of class-size reduction and how elementary students benefited from the smaller class size. This study will help school managers, teachers, and society understand the importance of creating an optimal learning environment based on students’ needs.

• Bain, H., Achilles, C. M., McKenna, B., & Zaharias, J. (1992). Class size does make a difference. Phi Delta Kappan, 74(3), 253-256.

• Bascia, N. (2010). Reducing class size: What do we know. Ontario Institute for Studies in Education.

• Becker, G. S. (2009). Human capital: A theoretical and empirical analysis with special reference to education. University of Chicago Press.

• Biddle, B. J., & Berliner, D. C. (2002). Small class size and its effects. Educational Leadership, 59(5), 12-23.

• Bohrnstedt, G. W., & Stecher, B. M. (1999). Class size reduction in California: Early evaluation findings, 1996-1998. American Institutes for Research. https://files.eric.ed.gov/fulltext/ED432809.pdf

• Chen, B., deNoyelles, A., Patton, K., & Zydney, J. (2017). Creating a community of inquiry in large-enrollment online courses: An exploratory study on the effect of protocols within online discussions. Online Learning, 21(1), 165-188. http://dx.doi.org/10.24059/olj.v21i1.816

• Correa, H. (1993). An economic analysis of class size and achievement in education. Educational Economics, 1(2), 129-135.

• Dee, T. S., & West, M. R. (2011). The non-cognitive returns to class size. Educational Evaluation and Policy Analysis, 33(1), 23-46.

• Dynarski, S., Hyman, J., & Schanzenbach, D. W. (2011). Experimental evidence on the effect of childhood investments on postsecondary attainment and degree completion. Journal of Policy Analysis and Management, 32(4), 692-717. https://doi.org/10.1002/pam.21715

• Ehrenberg, R. G., Brewer, D. J., Gamoran, A., & Willms, J. D. (2001). Class size and student achievement. Psychological Science in the Public Interest, 2(1), 1-30. https://doi.org/10.1111/1529-1006.003

• Evertson, C. M., & Randolph, C. H. (1989). Teaching practices and class size: A new look at an old issue. Peabody Journal of Education, 67(1), 85-105. https://doi.org/10.1080/01619569209538671

• Finn, J. D., Gerber, S. B., & Boyd-Zaharias, J. (2005). Small classes in the early grades, academic achievement, and graduating from high school. Journal of Educational Psychology, 97(2), 214-223. https://doi.org/10.1037/0022-0663.97.2.214

• Finn, J. D., & Achilles, C. M. (1990). Answers and questions about class size: A statewide experiment. American Educational Research Journal, 27(3), 557-577. https://doi.org/10.3102/00028312027003557

• Finn, J. D., Gerber, S. B., Achilles, C. M., & Boyd-Zaharias, J. (2001). The enduring effects of small classes. Teachers College Record: The Voice of Scholarship in Education, 103(2), 145-183. https://doi.org/10.1177/016146810110300204

• Fredriksson, P., Öckert, B., & Oosterbeek, H. (2012). Long-term effects of class size. The Quarterly Journal of Economics, 128(1), 249-285. https://doi.org/10.1093/qje/qjs048

• Gilraine, M., Macartney, H., & McMillan, R. (2018). Education reform in general equilibrium: Evidence from California’s class size reduction (Working paper 594). University of Toronto.

• Glass, G. V., & Smith, M. L. (1979). Meta-analysis of research on class size and achievement. Educational Evaluation and Policy Analysis, 1(1), 2-16. https://doi.org/10.3102/01623737001001002

• Graue, E., Rauscher, E., & Sherfinski, M. (2008). SAGE implementation and classroom quality. Wisconsin Center for Education Research.

• Grissmer, D. (1999). Conclusion: Class size effects: Assessing the evidence, its policy implications, and future research agenda. Educational Evaluation and Policy Analysis, 21(2), 231-248. https://doi.org/10.3102/01623737021002231

• Hamm, J. V., & Faircloth, B. S. (2005). Peer context of mathematics classroom belonging in early adolescence. Journal of Early Adolescence, 25(3), 345-366. https://doi.org/10.1177/0272431605276932

• Ho, D. E., & Kelman, M. G. (2014). Does class size affect the gender gap? A natural experiment in law. The Journal of Legal Studies, 43(2), 291-321. https://doi.org/10.1086/676953

• Hoxby, C. M. (2000). The effects of class size on student achievement: New evidence from population variation. The Quarterly Journal of Economics, 115(4), 1239-1285. https://doi.org/10.1162/003355300555060

• Hruz, T. (2000). The costs and benefits of smaller classes in Wisconsin: A further evaluation of the SAGE Program. Wisconsin Policy Research Institute. https://www.badgerinstitute.org/BI-Files/Reports/Vol13no6.pdf

• Iacovou, M. (2002). Class size in the early years: Is smaller really better? Educational Economics, 10(3), 261-290. https://doi.org/10.1080/09645290210127499

• Ingersoll, R. M. (2013). Why schools have difficulty staffing their classrooms with qualified teachers. Center for American Progress. https://repository.upenn.edu/gse_pubs/493

• Isenberg, E. P. (2010). The effect of class size on teacher attrition: Evidence from class size reduction policies in New York State (Paper No. CES-WP-10-05). US Census Bureau Center for Economic Studies. https://doi.org/10.2139/ssrn.1557228

• Kedney, R. J. (1989). Performance measurement in non-advanced further education: The use of statistics [Unpublished Ph.D. thesis]. University of Lancaster UK.

• Konstantopoulos, S. (2008). Do small classes reduce the achievement gap between low and high achievers? Evidence from project STAR. Elementary School Journal, 108(4), 275-291. https://doi.org/10.1086/528972

• Krueger, A. (2000). Economic considerations and class size (Working Paper #447). Princeton University Industrial Relations Section. http://www.irs.princeton.edu/pubs/working_papers.html

• Lazear, E. P. (2001). Educational production. Quarterly Journal of Economics, 116(3), 777-803. https://doi.org/10.1162/00335530152466232

• Loeb, S., Darling-Hammond, L., & Luczak, J. (2005). How teaching conditions predict teacher turnover in California schools. Peabody Journal of Education, 80(3), 44-70. https://doi.org/10.1207/s15327930pje8003_4

• Mathis, W. J. (2017). The effectiveness of class size reduction. Psychosociological Issues in Human Resource Management, 5(1), 176-183. https://doi.org/10.22381/pihrm5120176

• Nye, B., Hedges, L. V., & Konstantopoulos, S. (2002). Do low-achieving students benefit more from small classes? Evidence from the Tennessee class size experiment. Educational Evaluation and Policy Analysis, 24(3), 201-217. https://doi.org/10.3102/01623737024003201

• Nye, B., Hedges, L. V., & Konstantopoulos, S. (2004). Do minorities experience larger lasting benefits from small classes? Journal of Educational Research, 98(2), 94-100. https://doi.org/10.3200/joer.98.2.94-114

• Olalekan, A. B. (2016). Influence of peer group relationship on the academic performance of students in secondary schools: A case study of selected secondary schools in Atiba Local Government area of Oyo State. Global Journal of Human-Social Science, 16(4), 89-94.

• Lowenthal, P. R., Nyland, R., Jung, E., Dunlap, J. C., & Kepka, J. (2019). does class size matter? An exploration into faculty perceptions of teaching high-enrollment online courses. American Journal of Distance Education, 33(3), 152-168. https://doi.org/10.1080/08923647.2019.1610262

• Shin, Y. (2012). Do Black children benefit more from small classes? Multivariate instrumental variable estimators with ignorable missing data. Journal of Educational and Behavioral Statistics, 37(4), 543-574. https://doi.org/10.3102/1076998611431083

• Siegfried, J. J., & Kennedy, P. E. (1995). Does pedagogy vary with class size in introductory economics? American Economic Review, Papers and Proceedings, 82(2), 347-351.

• Smith, M. L., & Glass, G. V. (1980). Meta-analysis of research on class size and its relationship to attitudes and instruction. American Educational Research Journal, 17(4), 419-433. https://doi.org/10.3102/00028312017004419

• Smith, P., Molnar, A., & Zahorik, J. (2003). Class size reduction: A fresh look at the data. Educational Leadership, 61(1), 72-74.

• Trammell, B. A., & LaForge, C. (2017). Common challenges for instructors in large online courses: Strategies to mitigate student and instructor frustration. Journal of Educators Online, 14(1), 1-10. https://files.eric.ed.gov/fulltext/EJ1133615.pdf

• Tsavga, J. (2011). The effect of environment on the academic performance of students in Tarka Local Government Area of Benue State [Unpublished Master’s thesis]. Benue State University.

• Wilson, V. (2002). Does small really make a difference? University of Glasgow: The Scottish Council for Research in Education.

• Zahorik, J., Halbach, A., Ehrle, K., & Molnar, A. (2003). Teaching practices for smaller classes. Educational Leadership, 61(1), 75-77. http://www.asu.edu/educ/epsl/EPRU/documents/EPRU-0309-30-RW.pdf

• Zyngier, D. (2014). Class size and academic results, with a focus on children from culturally, linguistically and economically disenfranchised communities. Evidence Base, 1-24. http://doi.org/10.4225/50/5582118F8790B