This Guidance Document provides practical assistance to Country Offices scaling up programmes to manage SAM in young children. It outlines a step-by-step process through which countries can analyse their current situation, identify barriers and bottlenecks through the MoRES approach, and plan action to scale-up treatment. In particular it addresses the challenge of supporting governments to accelerate and sustain scale-up, build national capacities and source reliable and sustained supplies and financing for managing SAM. This document also provides complementary background information, references to international technical recommendations, resources and tools.