A significant and growing English learner (EL) population attends public schools in the United States. Evidence suggests they are at a disadvantage when entering school and their achievement lags behind non-EL students. Some educators have promoted full-day kindergarten programs as especially helpful for EL students. We take advantage of the large EL population and variation in full-day kindergarten implementation in the Los Angeles Unified School District to examine the impact of full-day kindergarten on academic achievement, retention, and English language fluency using difference-in-differences models. We do not find signficant effects of full-day kindergarten on most academic outcomes and English
INTRODUCTIONThe focus on education accountability, notably with the No Child Left Behind (NCLB) Act of 2001, has led to increased interest in improving student performance as early as possible. Policy efforts to enhance educational experiences for young children are based on the belief that student achievement is cumulative (Pianta, Cox, & Snow, 2007); therefore, early school success can lead to an increased likelihood of staying in school through high school graduation. Many state and local school district decision makers are interested in policies that expand kindergarten from half day to full day because of perceived benefits for learning (Clark & Kirk, 2000;Kauerz, 2005;Walston & West, 2004).1 However, evidence to date on the actual benefits is limited to short-term gains and does not address how English learner (EL) students fare, which is the focus of this study (Cannon, Jacknowitz, & Painter, 2006;DeCicca, 2007;Le et al., 2006;Lee et al., 2006;Rathbun & West, 2004;Walston & West, 2004).The perceived benefits have led to dramatic growth in the number of students attending full-day kindergarten programs across the country over the past few decades. In 1970, only about 13 percent of children were in full-day kindergarten classes (Elicker & Mathur, 1997), but that number has increased significantly to Bank, 2008). One reason often cited for changing to full-day classes is that they will provide extra academic instruction for economically disadvantaged students who start school with lower academic skills. Yet studies find that attending a full-day kindergarten program does not yield long-term benefits for either lowincome students or their higher-income peers (Cannon, Jacknowitz, & Painter, 2006;DeCicca, 2007). Notable disadvantages for districts offering full-day kindergarten include the costs of extra personnel, facilities, and materials; depending on the objective, these additional resources may be better allocated to other early childhood programs. Absent from past research on the effectiveness of full-day versus half-day kindergarten has been a focus on how full-day classes affect one specific disadvantaged group that may especially benefit from the extra time: EL students. Thus, the findings that full-day programs do not appear to produce better longer-term results than half-day programs are not n...