Multisite trials, in which individuals are randomly assigned to alternative treatment arms within sites, offer an excellent opportunity to estimate the cross-site average effect of treatment assignment (intent to treat or ITT) "and" the amount by which this impact varies across sites. Although both of these statistics are substantively…

This systematic descriptive historical review was conducted to examine the status and trends in expository text structure instruction efficacy research for first through twelfth grade students. The analysis included sixty studies, which spanned the years 1978 to 2014. Descriptive dimensions of the research included study type, research design,…

Background: Health professionals are looking to nutrition-based youth health interventions in K-12 schools to combat the growing obesity crisis; however, none have explored the influences of interventions guided by constructivist learning theory. Purpose: This study examined the influences of a constructivist-oriented nutrition education program…

This article discusses the difficulties in conducting intervention research or evaluating intervention programs in a school setting. In particular, the problems associated with randomization and obtaining control groups are examined. The use of quasi-experimental designs, specifically a paired comparison design using the individual as his or her…

This guide is designed as a resource for leaders and evaluators of K-12 online learning programs. In this guide, the term "online learning" is used to refer to a range of education programs and resources in the K-12 arena, including distance learning courses offered by universities, private providers, or teachers at other schools;…

The author discusses the selection and use of control groups, particularly in studies evaluating gifted programs. Factors affecting evaluation design decisions are outlined, the control and abuse of control groups is discussed, and some useful data collection design procedures are reviewed. Also considered is the analysis of data from contrast…

This article discusses research design problems peculiar to work with intellectually disabled subjects, such as discrepancies in uses of control groups and mental age matching, definitions of subject groups and variability within and between subject groups. Suggestions for minimizing these problems are made and alternative methodologies offered.…

Ninety-two research reports involving specifically language-impaired subjects were reviewed. Analysis showed few consistent trends with respect to subject selection, subject description, and the number and types of control groups. The importance of more complete subject descriptions and matching criteria for control groups is discussed.…

This commentary finds that the study reported in EC 605 442, which indicated long-term gains for children with autism who experienced intensive behavioral intervention as preschoolers, is reliable, correct, and important. The commentary supports the use of quasi-random assignment to experimental or control group when truly random assignment is not…

This commentary argues that the study reported in EC 605 442, which indicated long-term gains for children with autism who experienced intensive behavioral intervention as preschoolers, needs to be replicated to be convincing, especially given the problem of nonrandom assignment of experimental and control groups. (JDD)

This paper presents findings of a study that examined the effectiveness of the guidance program used by change agents in the Dutch School Improvement Project (NSIP) on program implementation. Sixteen schools composed the experimental group and 13 made up the control group. The experimental variable was the guidance strategy of the NSIP. The two…

Expresses the importance of scientifically based research in education reform and explains how to judge the validity of educational research. Describes control groups, randomized and matched experiments, statistical educational significance, sample size, and the difference between scientifically based and rigorously evaluated research. (Contains…

Presents a prototypical case illustrating what positivist research means and argues that even critics of positivist research are logically committed to propositions that can be tested only through positivist research paradigms. The relationship between the nature of a community's research enterprise and its educational provisions must be causal.…

This commentary on EC 605 442, which indicated long-term gains for children with autism who experienced intensive behavioral intervention as preschoolers, questions the magnitude of the student changes and their significance, because of concerns about the representativeness and comparability of the sample group and the failure to measure skills…

This commentary on EC 605 442, which indicated long-term gains for children with autism who experienced intensive behavioral intervention as preschoolers, emphasizes the need for replication. The replication study should use random assignment to experimental and control groups, a larger sample of cases, standard diagnostic instruments to delineate…