The Development of Object Fitting: The Dynamics of Spatial Coordination.

Fitting objects into apertures is an adaptive skill that is incorporated into the design of many tools. We match or align shapes with openings when we insert keys into locks, when we put lids atop containers, or when we align a screwdriver with the groove of a screw. Traditionally, the development of object fitting has focused on children's abilities to successfully complete shape sorter tasks (e.g., square peg through square hole). By measuring children's success in these tasks, investigators have determined that there is substantial development during the second year, but little research has addressed the processes children employ to solve object fitting challenges during this time period. Here, we provide a process based account of object fitting, which emphasizes how children coordinate information about spatial structure with action. We suggest that a process-based approach can illuminate the real-time dynamics of perceiving, acting, and thinking.