College student employment has been increasing steadily for at least four decades. At present, approximately 80% of all college students are employed while completing their undergraduate education. Even among students under the age of 24 at 4-year colleges, more than 50% are employed during the school year. Although some general trends are…

A meta-analysis examines studies concerned with the effects of vocabulary instruction on the learning of word meanings and on comprehension. It is concluded that vocabulary instruction has a significant effect on the comprehension of passages containing taught words, but significant effects are not found with all teaching methods. (Author/LMO)

Conducted a meta-analysis of 74 studies in which there had been an intervention that aimed to improve the behavioral, cognitive, or social functioning of people with attention deficit hyperactivity disorder or attention deficit disorder. Overall, there were larger effects of the various interventions on behavioral than on educational outcomes.…

A meta-analysis of studies conducted between 1974 and mid-1987 on sex differences in mathematical tasks is presented. Methods used include estimations of: (1) parameters for a random effects model, and (2) coefficients for a linear-regression equation, all based on effect sizes calculated from each study. Differences have been decreasing. (TJH)

While a review by S. Graham (1994) found no differences between blacks and whites on measures of need for achievement, this meta-analysis article found reliable and complex race differences. Overall, whites scored higher on measures of need for achievement, although differences nearly disappeared in studies after 1970. Possible explanations are…

S. Graham comments on taking a meta-analytic approach to reviewing race differences in need for achievement, discussing limitations of the methodology. A rejoinder by H. Cooper and N. Dorr supports the utility of meta-analysis in such studies and discusses disadvantages to narrative review. (SLD)

A meta-analysis including 96 experimental studies considers the effects of reinforcement/reward on intrinsic motivation. Results indicate that reward does not decrease intrinsic motivation, although interaction effects must be examined. An analysis with five studies also indicates that reinforcement does not harm intrinsic motivation. (SLD)

Presents the results of a meta-analysis of cross-time relations of academic/cognitive and social/behavioral readiness assessments from preschool to second grade that used 70 longitudinal studies. Discusses findings in terms of assessment and conceptualization of school readiness, the role of school and classroom experiences in individual…

Critiques the conclusions of S. Veenman (1995) about multigrade classes and suggests that selection bias and lower-quality instruction should be included as part of the explanation for his findings of no difference. Indicates that multigrade classes have at least a small negative effect on achievement and potentially negative effects on teacher…

D. Mason and R. Burns (1996) have concluded that multigrade classes have a slightly negative effect on students' achievement. However, a reanalysis, based on meta-analytic procedures, of the available studies shows the average weighted effect sizes to be essentially zero or close to zero. Contains 51 references. (SLD)

The analysis by R. Greenwald, L. Hedges, and R. Laine (1996) suffers because of its statistical methods and because it is based on a sample that biases the study toward their conclusions. Econometric evidence and the aggregate performance of U.S. schools points toward serious problems with inefficient use of resources. (SLD)

Supports the findings of a meta-analysis that demonstrates that student achievement is related to the availability of resources, disagreeing with criticisms of method and sample selection made by E. Hanushek (1996). (SLD)

Since the early 1970s, many educators have touted writing as a means of enhancing learning. Several reasons have been suggested for this purported enhancement: that writing is a form of learning, that writing approximates human speech, that writing supports learning strategies. Alternatively, some researchers have cautioned that the educative…

Recent meta-analyses and other studies of media's influence on learning are reviewed. Consistent evidence is found for the generalization that there are no learning benefits to be gained from employing any specific medium to deliver instruction. Problems and suggestions concerning current media attribute and symbol system theories are described.…

A descriptive analysis of research practices and a meta-analysis of control group effect sizes are used to address Hawthorne effects in educational experiments. The analysis of 86 studies and 256 treatment/Hawthorne/no-treatment control group effect size comparisons indicate that artifact controls have limited utility in dealing with the Hawthorne…