The number sequences describe a hierarchy of students' concepts of number. This research uses two defining cognitive structures of the number sequences--units coordination and the splitting operation--to model middle-grades students' abilities to write linear equations representing the multiplicative relationship between two unknowns. Results…

Effective belief-desire reasoning requires both specialized representational capacities--the capacity to represent the mental states as such--as well as executive selection processes for accurate performance on tasks requiring the prediction and explanation of the actions of social agents. Compromised belief-desire reasoning in a given population…

A study examined and tested the knowledge sources individuals tap in the planning process and the process of plan modification. It is expected that contrary to plan-based theories, individuals will fail to remediate flaws in their plans if given the chance to develop a plan to pursue the same goal. It is also expected that differences exist…