The document discusses three approaches to constructing social science curriculum: concentric, spiral, and topical. The concentric approach teaches from simple to complex concepts in a sequential manner. The spiral approach revisits topics over time to provide continuity and linkage while increasing complexity. The topical approach selects age-appropriate topics to study completely before moving to new topics. Each approach has advantages like following learning principles or adapting to students, and limitations like lacking continuity or being too complex. The author concludes different approaches can help construct curriculum systematically to achieve social science objectives.