The toolkit provides a practical, “how-to” guide for selection and adaptation of child development measurements for use in low- and middle-income countries. Users can follow the proposed step-by-step process to select, adapt, implement, and analyze early childhood development data for diverse purposes and projects. The book updates and expands a previous 2009 edition, incorporating new research on the use of child development measurement tools in low- and middle-income countries. The ECD Measurement Inventory that accompanies this toolkit contains 147 measurement tools for children under eight years.