We offer a new conceptualization and measurement models for constructs at the group-level of analysis in small group research. The conceptualization starts with classical notions of group behavior proposed by Tönnies, Simmel, and Weber and then draws upon plural subject theory by philosophers Gilbert and Tuomela to frame a new perspective…

Construct validity findings from Campbell-Fiske and LISREL confirmatory factor analyses of a multitrait-multimethod matrix were compared for 252 low-track and 588 high-track eleventh- and twelfth-grade students. The manner in which construct validity varies across groups is also discussed. (SLD)

Extensions of the confirmatory factor analysis approach to multitrait-multimethod data are demonstrated, and self-other agreement on multiple dimensions of self-concept are evaluated in 2 studies investigating the ability of significant others to infer multiple dimensions of self-concept for 151 Australian and 941 Canadian college students. (SLD)