Preface In this research, I will study the effects of class size on student achievement. The class size debate is an age-old debate in American education. The debate centers on whether class size is a factor that can affect student performance. Currently, many have moved to very large or small classes. As a student, I am interested to see how class sizes might affect my academic performance. Research was contacted on March 1, 2015. I use five sources, 3 peer-reviewed journal articles, 1 newspaper article, and 1 magazine article. Annotated BibliographyInquiry Question: How does class size affect student achievement?Attwood, Rebecca. “Height matters for students’ grades.” Times Higher Education “Class size and student performance at a public research university: A cross-classification model.” » Higher Education 51.8 (2010): 701-723. Premier Academic Research. Internet. March 8, 2015. This article addresses the problems inherent in previous studies and reviews that have questioned the influence of class size on student grades. It also highlights to other researchers in this field how these issues could lead to discrepancies in their research findings. The article draws on the use of statistics and data conducted in previous studies since 1990. It shows that most of these studies applied two approaches, the "constructivist" approach which concludes that class size has a significant effect on student grades because the student has a high chance to interact with the instructor in small classes (Johnson). The second approach is “behavioral” which concludes that class size has no impact, with the main factor in student success being the behavior and skills of the instructors within the class (Johnson). The article also states that the most popular finding of these studies was that "smaller classes can often lead to better grades" and that "increasing class sizes has a significant negative effect on final grades" ( Johnson). The article is written by Iryna Johnson, a higher education researcher at Auburn University, which gives the article more credibility (“About Us – Staff.”). Additionally, the article was published by Higher Education, an international higher education journal, which reports on studies of problems encountered in universities and colleges ("Higher Education - Springer"). I will use this source to show the two approaches that have been taken in research on the region and provide the evidence that has been used to support each approach. This article represents perfectly for the