A field experiment examines how enrollment defaults affect the take-up and impact of an education technology (N=6,976). It shows that a standard (high-friction) opt-in process induces extremely low parent take-up (
Bergman, Peter, Jessica Lasky-Fink, and Todd Rogers. "Simplification and Defaults Affect Adoption and Impact of Technology, But Decision Makers Do Not Realize This." HKS Faculty Research Working Paper Series RWP17-021, June 2017 (Updated July 2018).