The document outlines 14 principles of learner-centered psychological principles (LCP) developed by the American Psychological Association. The principles are divided into cognitive/metacognitive factors, motivational/affective factors, developmental/social factors, and individual difference factors. They state that learning is most effective when the learner is actively involved, goals are set, knowledge is constructed by linking new information to prior knowledge, strategic thinking is used, thinking is influenced by environment, motivation and emotions affect learning, development and individual differences are accounted for.