Much of the currently available evidence on the causal effects of public prekindergarten programs on school readiness outcomes comes from studies that use a regression-discontinuity design (RDD) with the age cutoff to enter a program in a given year as the basis for assignment to treatment and control conditions. Because the RDD has high internal…

The increasing trend of placing students with disabilities in general education classrooms has raised questions among researchers, policymakers, practitioners, and parents about classmate peer effects on all students. However, little is known about the peer effects of classmates with disabilities on the outcomes of other students in the classroom;…

Research in fields other than education has found that studies with small sample sizes tend to have larger effect sizes than those with large samples. This article examines the relationship between sample size and effect size in education. It analyzes data from 185 studies of elementary and secondary mathematics programs that met the standards of…

External and implementation factors and their potential threats to field test validity and the practical realities of the field testing process on results are discussed. External factors include site selection, negotiations, contracts, site monitoring, training, and type of product. Implementation factors include motivation, dependence on local…

Applied ethnography has strengths in areas that vitally need research and can inform policymakers in areas where rationalism and positivism cannot. However, several threats to the ethnographic approach are posed by a utilitarian culture, e.g., redefinition of the variables studied, a focus on discrete facts and "controlling" knowledge…

Studied national educational datasets in Japan during the post-World War II era. Found that current datasets do not contain questions about family background or rank of school attended that are detailed enough to permit an analysis of the impact of family background on educational attainment. (SLD)

The assumptions of interpretive (or naturalistic) inquiry are incompatible with the desire for foundation criteria and procedures. Critical analysis of the historical views of Dilthey and Weber and the contemporary writings of Guba are used to support this position. (BS)

A study of school district uses of evaluation and test data is used to illustrate the variety of ambiguities that can appear in qualitative data. Rules of evidence to distinguish valid and potentially nonvalid testimony are proposed. Uses of testimony in evaluation are discussed. (BS)

Problems that face evaluators, including field based evaluations, are discussed. The author states that open communication, access to data, and an ability to be accepted are paramount; knowledge of randomness, robustness and homoscedasticity may be secondary. (Author/PN)

The recent research on school or educational leadership is reviewed in an attempt to define some of the major recurring research problems. This paper outlines and describes both methodological problems and organizational perspective problems so that future research efforts can be strengthened. (BW)

Research in the area of the instructional leadership of the school administrator is reviewed. Weaknesses in studies of instructional leadership are grouped as methodological, measurement, and conceptual problems. These problems define an agenda for improving research in the area of instructional leadership. (SLD)

The extent to which students with disabilities are represented in national data collection programs was investigated by reviewing nine such programs that are receiving attention in current educational reform initiatives. Results suggest that 40-50% of students with disabilities are excluded from these prominent data collection programs. (SLD)

This article summarizes the findings of the National Research Council (NRC) report "On Evaluating Curricular Effectiveness" and examines the reviews in middle grades mathematics undertaken by the What Works Clearinghouse (WWC). The NRC report reviewed and assessed 147 key evaluations of 13 National Science Foundation-supported K-12 mathematics…