The author analyzes some of the conceptual problems which have prevented a direct test of the discovery learning hypothesis, provides an operational definition of discovery learning, and proposes an improved experimental paradigm. Appended are 38 references. (AA)

It is argued that time generalizability exists independent of population and situation generalizability, although the three may interact. Problems associated with sampling and randomization efficacy over time are discussed. (Author/GK)

Discusses the role of research methodology as disciplined inquiry in educational research. Uses examples to address issues of generalizability of results, precision, and choice of research methods. (MK)

The article illustrates a method to estimate changes in the statistical power of a study which are caused by changes in the reliability of the dependent variable. (Author)

Active parental consent policies have been blamed for low participation rates and selection bias (i.e., loss of "high-risk" youths) in school-based studies. In this article, the authors describe active consent procedures that produced an overall active consent rate of 79% in a sample of more than 4,500 middle school students attending 29…

Describes problems in implementing placebo controls in psychotherapy including the difficulty of ensuring that therapists and their patients will view both the experimental and placebo treatments as comparably credible. Considers six research issues stemming from the definitional requirement that the placebo control for the critical and specific…

Author responds to critique by Daniel Griffiths (Educational Administration Quarterly v. 19, p. 201-21) by defending his work in three areas: derivation of hypotheses, testing of hypotheses, and erroneous attribution of assumptions. (JW)

Suggests a possible research strategy for ensuring successful follow-up of respondents in longitudinal surveys. (TO)

A weighted harmonic means analysis is presented that incorporates all of the available data, preserves the planned proportionality of the design, and avoids the problems associated with the replacement of missing data with sample estimates. (Author/BW)

A solution to some problems of maximized contrasts for analysis of variance situations when the cell sizes are unequal is offered. It is demonstrated that a contrast is maximized relative to the analysis used to compute the sum of squares between groups. Interpreting a maximum contrast is discussed. (Author/GK)

This article builds on an earlier discussion of the importance of the Type II error (beta) and power to the hypothesis testing process (CE 511 484), and illustrates the methods by which sample size calculations should be employed so as to improve the research process. (Author/CT)

Discusses a 1993 study by Frazier, d'Arcais, and Coolen intended to test Schreuder's (1990) Morphological Integration model concerning the processing of separable and inseparable verbs. Suggests that the logic of the experiment is flawed and that the data do not warrant the author's conclusions. (DR)

Discusses a 1993 study by Frazier, d'Arcais, and Coolen intended to test Schreuder's (1990) Morphological Integration model concerning the processing of separable and inseparable verbs, and attempts to refute Kempen's objections to their interpretation of the experimental results in this issue. (DR)