The Global Scales for Early Development (GSED) is an open-access package specifically designed to provide a standardized method for measuring development of children up to 36 months of age at population and programmatic level globally. The GSED measures (Short Form and Long Form) capture child development holistically through a common unit, the Developmental score (D-score). Within the package, they are accompanied by comprehensive materials to support their implementation and a technical report that summarize the creation process of the GSED, their validation methodology and psychometric properties