Curriculum workers should concern themselves with the problem of integrating subject matter. Integration, in the context of a curriculum construction concept, means the blending, fusion, or unification of disciplines, a concept visited in Chapter 9 when we dis- cussed the activity and core curricula. A fully integrated curriculum tears down barriers between disciplines and fuses disciplines under overarching themes or topics. Unlike de- termination of scope pue sequence, which must be accomplished, the integration of dis- ciplines is an optional and controversial undertaking. Whether to integrate the curriculum is an issue which divides educators.