This document discusses models of curriculum integration. It defines integrated curriculum as connecting different subject areas through themes, topics or problems. Three main models are described: interdisciplinary, problem-based, and theme-based. The interdisciplinary model groups subjects into blocks of time allowing for flexibility. The problem-based model centers on solving technological problems that require multiple subject areas. The theme-based model organizes subjects around an overarching theme. Implications of integrated curriculum include shifting to a more constructivist approach, extensive teacher training, and systemic reforms.