About K²ID

Last modified: September 2017. Please note that the homepage is not being updated anymore as the project has been completed.


K2ID is short for „Kinder und Kitas in Deutschland“ and refers to the German name of the surveys carried out as part of a project entitled “Early childhood education and care quality in the Socio-Economic Panel” (K²ID-SOEP).

It aims at investigating effects of the quality of early childhood education and care (ECEC) institutions on children’s development and parents’ employment and wellbeing. It also examines socio-economic differences in parental choices of ECEC quality and whether they are linked to information asymmetries between mothers and ECEC providers.

The project collects new data on the quality of ECEC institutions, which are attended by children below school age who are sample members of a representative annual household panel study for Germany, the Socio-Economic Panel Study (SOEP). 

The project started in September 2013 and was funded by the Jacobs Foundation. 

The project ended in April 2017. In March 2017, we held an interdisciplinary conference on ECEC quality.  


Early Childhood Education and Care Quality and Child Development of Twins (K²ID-Twins).

The project aims to extend the theoretical and methodological approach used in the SOEP-ECEC Quality Project by taking into account that the impact of care quality might be also contingent on family processes and individual genetic makeup.

For this purpose  the youngest cohort of the TwinLife study (http://www.twin-life.de/de/), which comprises 5 year-old monozygotic and dizygotic twins before school entry, was extended by a parental questionnaire and a daycare center investigation in a design parallel to the K²ID project “Early childhood education and care quality in the Socio-Economic Panel”(the K²iD-twins sample).

The three-year project was launched in October 2014. The TwinLife Study started in autumn 2014 and will last until 2023. Though the K²ID-Twins study is cross-sectional based on the first wave of TwinLife only, the TwinLife study design will allow for investigating longer-term consequences of early childhood education and care quality in in the following waves.