This document discusses constructivism and concept learning. It describes two views of constructivism: individual constructivism which emphasizes internal knowledge construction, and social constructivism which views knowledge as socially constructed. It identifies four key characteristics of constructivism: learners construct understanding, new learning depends on prior knowledge, social interaction facilitates learning, and meaningful learning occurs through authentic tasks. The document then focuses on concept learning, describing concepts as feature lists, prototypes, exemplars, schemas and scripts to organize knowledge. It provides recommendations for making concept learning effective.