Cohort update: Wave 2 of the Global Flourishing Study

The Global Flourishing Study is a longitudinal panel study designed to advance research on human flourishing across culturally and geographically diverse contexts. Wave 1 included more than 200,000 adults from 21 countries and one territory, recruited to be approximately nationally representative of adult (18+) populations. The initial cohort profile detailed the Wave 1 sampling design and implementation. In this cohort profile update, we describe major developments since the original profile was published, including a mid-year retention survey, completion of Wave 2 data collection, and inclusion of mainland China data. We summarize attrition patterns across countries, methodological refinements, and potential research applications. Key strengths of the Global Flourishing Study include its multinational scope, longitudinal design, representative sampling, and open data access, while limitations include reliance on self-reports and variability in some aspects of the methodology across samples (e.g., differences in timing of data collection and weighting approaches). Beyond a continued commitment to open science, future directions of the Global Flourishing Study include expanding to subsequent waves and the potential addition of new countries and item modules.