This document discusses metacognition and learner-centered psychological principles. It defines metacognition as awareness and understanding of one's own thinking and learning processes. There are three categories of metacognitive knowledge: knowledge of person variables, knowledge of task variables, and knowledge of strategy variables. The document also outlines 14 learner-centered psychological principles grouped into cognitive/metacognitive, motivational/affective, developmental/social, and individual differences factors that influence learning. Effective learners employ metacognitive strategies like self-monitoring and strategic thinking.