Scoop uses existing longitudinal panel studies in the Netherlands and abroad and cross-sectional studies over time or between countries . Interlinking and reusing the available data can provide valuable information. The family and its members often constitute the main units of panel studies, such as the Netherlands Kinship Panel Study (NKPS), the Dutch multigenerational LifeLines study, the German Socio-Economic Panel (SOEP), the British Household Panel Survey (BHPS), the Swiss Household Panel, and the American Panel Study of Income Dynamics (PSID). A characteristic of these panel studies is that they run over an extensive period of time, making them suitable for answering questions on sustainable cooperation. Ongoing cross-sectional international comparative datasets include the World Value Study (1990-2015), International Social Survey Program (ISSP, 1985-2015), European Values Study (EVS, 1981-2008), European Social Survey (ESS, 2002-2016), European Working Conditions Survey (EWCS, 2005-2015), European Quality of Life Survey (EQLS, 2003-2012), and the Survey of Health, Ageing and Retirement in Europe (SHARE, 2004-2013). Through the comparison with data sets from neighboring countries, we can determine whether SCOOP’s findings can be extrapolated beyond national boundaries.