Second-order latent growth curve models (S. C. Duncan & Duncan, 1996; McArdle, 1988) can be used to study group differences in change in latent constructs. We give exact formulas for the covariance matrix of the parameter estimates and an algebraic expression for the estimation of slope differences. Formulas for calculations of the required sample…

Examines how systems thinking, simulation, and modeling affect secondary school teachers' classroom processes. Highlights include a two-dimensional matrix to show patterns of adaptation, teacher proficiency with technology, curriculum development, time constraints, teacher training, expertise, accountability, administrative issues, and the…

Explains how a spreadsheet can be an effective modeling and simulation tool for studying electrical circuits. Highlights include Kirchoff's rules and matrices algebra; a pilot experiment with preservice teacher education students in a physics class; the teacher's role; student attitudes; curricular aspects; and the effectiveness of the spreadsheet…