The document defines key terms related to cognitive development including accommodation, assimilation, disequilibrium, equilibrium, guided participation, developmental milestone, scaffolding, stage theory, zone of proximal development, internalization, and plasticity. Examples are provided to illustrate each term.

2. Accommodation- dealing with a new object or event by either modifying an existing scheme or forming a new one A little boy always knows to push open his bedroom door. When he goes to his grand mom's house, her door must be pulled open. The little boy tries to push it but it won’t open, he then realizes to pull it toward him.