The document discusses two strategies for scaling up school-based developments: dissemination and systemic scaling up. The dissemination strategy focuses on spreading know-how between networked schools and has a more direct but limited impact. The systemic scaling up strategy modifies schools' environments more flexibly to infiltrate innovations, involving more schools but with less intensive impact. It also has relatively lower development costs but a greater burden on state budgets. Successful scaling up requires considering factors like decentralization and support mechanisms, as well as connecting top-down and bottom-up approaches through school absorption capacities and environmental enrichment.