Constructivism emphasizes that learning occurs through combining new and old ideas through active engagement, trial and error, and inference making. It promotes problem-based, collaborative learning and discourages competition. Schema theory and transactional theory view reading as an active process where readers' unique background knowledge interacts with text. Engagement theory finds that instructional practices involving themes, choice, and authentic activities can increase reading achievement across demographics by boosting engagement. Effective reading instruction incorporates strategies like modeling, collaboration, and authentic assessments.