For the international Trends in International Mathematics and Science Study (TIMSS2007) math and science motivation scales (self-concept, positive affect, and value), we evaluated the psychometric properties (factor structure, method effects, gender differences, and convergent and discriminant validity) in 4 Arab-speaking countries (Saudi Arabia,…

Using multitrait, multimethod data, and confirmatory factor analysis, the current study examined the effects of arithmetic item formatting and the possibility that across formats, abilities other than arithmetic may contribute to children's answers. Measurement hypotheses were guided by several leading theories of arithmetic cognition. With a…

Using a fifth-grade sample, the revised Self Description Questionnaire was investigated. Confirmatory factor analysis showed the factor structure invariant across the respondants' gender. Sex difference in self-concept areas and academic achievement were explored. A new internal/external frame of reference model was proposed. (Author/BS)