The international development community still does not understand enough about how, where and why the best results happen. Can using the SDG indicators to measure results begin to fill this knowledge gap? This Chapter outlines the issues and reviews progress to-date in integrating SDG indicators into national planning and development co‑operation practices. Case studies in the sectors of education, sanitation and energy access reveal that both governments and providers of development co-operation are increasingly using SDG indicators to guide their efforts. A closer examination of three large recipient countries (Ethiopia, Kenya and Myanmar) suggests that providers are facing four interrelated challenges. First, the cost of using specific SDG indicators varies in relation to indicator complexity. Second, providers that synchronise their country-level results planning with partner countries’ own cycles find it easier to align to and measure SDG indicators. Third, reliance on joint monitoring approaches helps providers reduce the cost of SDG monitoring. Finally, while disaggregating SDG data by gender and by urban/rural dimensions is common, other data disaggregation that could help to leave no one behind is rare.