In this commentary, we demonstrate how the potential outcomes framework can help understand the key identification assumptions underlying causal mediation analysis. We show that this framework can lead to the development of alternative research design and statistical analysis strategies applicable to the longitudinal data settings considered by…

Argues that the status of the concept of equilibration is classified by considering Piagetian theory as a research program in the sense elaborated in 1974 by Lakatos. A pilot study was made to examine the precision and testability of equilibration in Piaget's 1977 model.(Author/RH)

Uses an experience from a senior-level research design class to disprove textbook suggestions that the illusory movement of the autokinetic effect is susceptible to suggestion. Cautions instructors not to use these misleading textbook accounts simply because they are a "grabber." (Author/GEA)

The inclusion of an ethnographic approach within the basic framework of a quantitative one is outlined in an attempt to combine their methodologies. Examples from an ethnographic case study of kindergarten aged children in Utuado, Puerto Rico are used to illustrate the issues being discussed, especially research design. The Puerto Rican study…

Explains the characteristics and importance of random assignment in experimental research on education. Considers factors supporting causal inferences, the nature of "assignment units," differences between random sampling and random assignment, the characteristics of randomization tests, forms of random assignment, and effects of experimental…

Post-hoc blocking and analysis of covariance (ANCOVA) both employ a concomitant variable to increase statistical power relative to the completely randomized design. It is argued that the advantages attributed to the block design are not always valid and that there are circumstances when the ANCOVA would be preferred to post-hoc blocking.…

Discusses the purposes and benefits of data synthesis, explaining the major techniques of extracting information from related studies and using it to explain conflicting outcomes. Stresses the importance of the analyst's attention to detailed features of each study and describes the steps of a systematic approach to synthesis. (SK)

Discusses the effects of sampling scheme selection on the admissibility of log-linear models for multinomial and product multinomial sampling schemes for prospective and retrospective sampling. Notes that in multinomial sampling, marginal frequencies are not fixed, whereas for product multinomial sampling, uni- or multidimensional frequencies are…

This chapter advocates the use of naturalistic inquiry as a method for undertaking unobtrusive research in instructional development. The advantages of naturalistic inquiry are listed, and it is suggested that these advantages make this form of research very useful to the field of instructional development. It is argued that both naturalistic…

What is meant by "normal science" is described, the first three steps in the "route to normal science" are outlined, and an example is given in which the trend toward research consensus is apparent. This involves current work on learning addition and subtraction. (MNS)

Views intercoder reliability as a sampling problem for content analyses. Develops a formula for generating sample sizes needed to have valid reliability estimates. Suggests steps for reporting reliability. (TB)

This symposium paper looks at three paradigms for naturalistic research on visuals: the positivistic, the interpretive, and the critical approaches. Discussion centers on questions of epistemology, such as "What do you mean?" and "How do you know?" The place of naturalistic inquiry within this discussion is indicated, and…

Provides a point-by-point response to the questions raised in Pasnak's review (S0 515 248). Attention is called to design and measurement issues for future research. (Author/JDH)

Derives three guidelines for management information systems (MIS) planning research by illustrating similarities between research streams of MIS planning and organizational strategic planning: recognition of MIS planning levels hierarchy and corresponding hierarchy in MIS planning benefits; specific attention to operationalization of constructs;…

Glass and Smith's (EJ 207 324) conclusion supporting small class size may be true, but it is not supported by their evidence. Their analysis does not recognize intervening factors and varying class sizes. (CP)