INTRODUCTION Introduction to the special issue on the PAPA project

摘要

The PAPA project reflects one of if not the largest theory-based field experiments in sport and exercise psychology that has taken place across five European countries; namely, England, France, Greece, Norway and Spain. Grassroots soccer was the targeted sport setting in PAPA due to the huge popularity of youth soccer in countries around the world (Kunz, 2007; Malina, 2005).