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 de- lineate 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.