Going forward, this work has the potential to bear more fruit. We hope that the critical thinking about conceptual and methodological is sues as well as their intersection, will lay the foundation for future re- search. Specifically, this special issue makes clear that work on measures of social and emotional development should more sharply deineate and define constructs within subdomains, strive to provide doc- umentation of key aspects of measures in thorough and consistent detail, make clear how existing (and forthcoming) measures align with a map of subdomains and constructs, and prioritize the develop- ment of psychometrically strong measures as a non-negotiable feature of the larger research agenda.