The sources of variability residing in the environment of individuals with autism and the implications for research studies are explored. Recommendations are provided for future research including research focusing on young children, on the methods needed to produce desirable outcomes, on relationships between behaviors, and on specific teaching…

A research review supports the validity of the person-environment fit (PEF) model in vocational psychology; however, sampling inadequacies have influenced results. One PEF example, Holland's hexagonal model, is unsupported due to lack of commensurate measurement; most hexagonal congruence indices are invalid. (Contains 110 references.) (SK)

Includes "P-E [Person-Environment] Fit as Paradigm" (Dawis); "Pitfalls of Congruence Research" (Gati); "The Next Millennium of 'Fit' Research" (Hesketh); "Holland's Hexagon Is Alive and Well--Though Somewhat out of Shape" (Prediger); "Tinsley on Holland: A Misshapen Argument" (Rounds, McKenna,…

The ability of individuals to make accurate judgments about others is examined and literature on this subject is reviewed. A wide variety of situational factors affects the appraisal of performance. It is generally accepted that the purpose of the appraisal influences the accuracy of the appraiser. The instrumentation, or tools, available to the…

The effects of selective dropout and retesting on the assessment of developmental changes in abilities during adolescence are examined. (ST)

This report analyses justifications gathered in a series of studies which led intellectually normal infants' school and nursery school children and mildly mentally retarded special day school children to acquire conservation understanding. Two hundred and five children were given a pretest of number, mass, length, liquid, and weight conservation.…

Small group research presently suffers from five major weaknesses: lack of a common conceptual base, lack of appropriate design, lack of external validity, lack of adequate instrumentation, and lack of appropriate statistical procedure. Application of Cattell's three panel model (involving syntality, characteristics of internal structure, and…

Discusses and explains experimental validity, including both internal and external validity, in terms that a classroom teacher can understand and use in his own research. (CK)

The choice of the clustering method, the similarity measure, the computer program, and the procedure for estimating the number of clusters should be clearly specified in any journal article using cluster analysis. Adequate evidence of a cluster solution's validity should be provided before the solution is published. (Author)

Considered two unexplored issues concerning use of parental ratings to measure young children's temperament: (1) the validity of such measures, and (2) parents' projection of their own personality in rating their children. (Author/DB)

Educational researchers and policymakers need to understand the ecological correlation fallacy, since so much bad research (and policy) has been based on it. Aggregate data may or may not yield results that are true for individuals. Only individual-level data can correctly answer questions about the relationship between variables for individuals.…

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)

Recognition of radio and television antismoking messages was measured in 6 treatment and 4 control cities. A survey of 574 adolescents found high recognition of messages even in areas where they were not broadcast, reinforcing the need for true control groups and distinctive messages to ensure validity in mass media evaluation. (SK)

Criticizes an earlier essay that questioned the validity of contemporary educational research practices, especially those involving experimentation. Argues that research using experimentation is valid and can lead to new and generalizable knowledge. (FMW)

Three types of methodological issues particularly salient in research involving the assessment of substance use or abuse are discussed with strategies for avoiding problems: (1) the reliability and validity of methods; (2) the variability and episodic course of substance use; and (3) the heterogeneity of individuals with substance use disorders.…