Hammond's Cognitive Continuum theory posits that certain task features induce distinct processing modes (e.g., intuitive or analytic) and thus result in qualitatively different decision performance. Although the theory suggests the relation between task features and performance characteristics a priori, the validity of these predictions requires…

Explored are various aspects of drawing graphs on surfaces. The Euler's formula, Kuratowski's theorem and the drawing of graphs in the plane with as few crossings as possible are discussed. Some applications including embedding of graphs and coloring of maps are included. (YP)

The pre-math computer program for preschool children that is described is divided into subprograms representing different basic numerical concepts--discrimination, recognition, and recall--and presents research design used to test the program's effectiveness with Head Start preschool children. Results indicate the program was ineffective…