A Mobile Intervention for Self-Efficacious and Goal-Directed Smartphone Use in the General Population: Randomized Controlled Trial

Jan Keller   ¹ , DPhil ;   Christina Roitzheim   ² , MSc ;   Theda Radtke   ³ , Prof Dr ;   Konstantin Schenkel   ⁴ , MSc, DPhil ;   Ralf Schwarzer   ^{1, 5} , Prof Dr

¹ Department of Education and Psychology, Freie Universität Berlin, Berlin, Germany

² Department of Psychology, Humboldt Universität zu Berlin, Berlin, Germany

³ Institute of Psychology, University of Wuppertal, Wuppertal, Germany

⁴ Department of Psychology, University of Zurich, Zurich, Switzerland

⁵ SWPS University of Social Sciences and Humanities, Wroclaw, Poland