# Turning milestones into measurement

Children learn to walk, speak, and think at an astonishing pace. The D-score captures this process as a one-number summary. The D-score booklets explain why we need the D-score, how we construct it, and how we calculate it. Application of the D-score enables comparisons in child development across populations, groups and individuals.

We are preparing four D-score booklets under the following titles:

Editors: Stef van Buuren, Iris Eekhout

Booklet I is currently available as a complete draft. The text of Booklet II is almost complete, whereas much of the text of booklets III and IV still needs to be written. The series addresses conceptual aspects of the D-score, discusses practical issues, and introduces a dedicated set of R packages.

The Health Birth Growth and Development knowledge integration (ki) program of the Bill & Melinda Gates Foundation kindly supports the work.