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Peer reviewedKrendl, Kathy A.; Fredin, Eric S. – Journal of Educational Technology Systems, 1986
This field study examined learning effects attributable to instructional design characteristics when eighth-grade science students used a print encyclopedia or a videotex version of the encyclopedia to write term papers. Results suggest that specific effects of instructional design characteristics of a delivery system are of a limited nature. (MBR)
Descriptors: Cognitive Ability, Comparative Analysis, Delivery Systems, Encyclopedias
Peer reviewedLaPrelle, John; And Others – Evaluation Review, 1992
High intercommunity variation in adolescent smoking precluded detection of effects of mass media campaigns on initiation of cigarette smoking in a study with a final sample of 1,637 adolescent subjects. Implications for studies using the individual as unit of analysis and the community as unit of randomization are discussed. (SLD)
Descriptors: Adolescents, Analysis of Variance, Community Programs, Etiology
