Women of reproductive age (WRA) are often nutritionally vulnerable because of the physiological demands of pregnancy and lactation. Requirements for most nutrients are higher for pregnant and lactating women than for adult men. The Minimum Dietary Diversity for WRA (MDD-W) 3 indicator defined and described in this document is a food group diversity indicator that has been shown to reflect one key dimension of diet quality: micronutrient adequacy, summarised across 11 micronutrients (Martin-Pr ével et al., 2015). The indicator constitutes an important step towards filling the need for indicators for use in national and subnational assessments. Such indicators must be relatively simple to collect and suitable for large surveys.