Few issues related to child development have sparked as much public debate as the question of how smartphones affect children’s wellbeing. Despite the intense public interest, the empirical evidence remains surprisingly limited: There is a notable lack of studies capable of precisely quantifying these effects. This project aims to close this gap by providing a robust scientific foundation for recommendations to policymakers, schools, and families.

The SMART KIDS study is the world’s first randomized controlled trial (RCT) to investigate the effects of smartphone ownership on children’s psychological development and wellbeing. The study is scheduled to take place during the 2026/27 academic year. Using a citizen‑science approach, the research team will collaborate with approximately 500 families of primary school children in Germany, Austria, and Switzerland who intend to purchase a smartphone for their child in the near future. Within the study, the exact timing of when the child receives the smartphone will be randomly assigned. Over a twelve‑month period, data on children’s smartphone use, psychological wellbeing, and learning and self‑regulation skills will be collected through regular surveys completed by parents and children. In addition, families will provide anonymized usage data from the children’s smartphones, enabling an objective assessment of actual device use. This approach will allow researchers to generate robust scientific insights into the opportunities, risks, and protective factors associated with children’s smartphone use.

Families interested in joining the study are invited to contact us at the email address: smartkids@iwm-tuebingen.de

Who can take part?

Families with a child that is currently enrolled in 3rd or 4th grade at a primary school in Germany, Austria or Switzerland.

Further prerequisites:

• You are considering buying your child their first smartphone this year and are willing to let the study determine the exact timing of when the phone will be handed over.
• You are willing to invest some time to complete several questionnaires and to install a research app on your child’s smartphone.
• Your child is also interested in taking part and is willing to answer short questions about their wellbeing on the smartphone over a period of three weeks.
• As a thank‑you for participating, all children will receive a voucher of their choice. The study results will be shared with interested parents.