This chapter provides a summary and a systematic synopsis of the theoretical approaches and the empirical results. It gives a comparative overview over the temporal and spatial pattern of the diffusion process and critically reflects the theoretical approaches and the applied methods. A basic insight of this comparative conclusion is that the macro-quantitative approach of network diffusion event history analysis has great benefits for global studies on social policy diffusion, but in-depth case studies still remain important for revealing the diffusion mechanisms. Future research should more systematically combine both perspectives.