“…As long‐term changes in disruptive child behaviors are essential to actually changing a child's developmental trajectory, this limits our conclusions on the effectiveness of the IYPT to immediate effects. The evidence points to a maintenance of treatment effects on disruptive child behaviors over several years for behavioral parent interventions in general (van Aar, Leijten, Orobio de Castro & Overbeek, 2017) and for the IYPT in particular (e.g., Azevedo, Seabra‐Santos, Gaspar & Homem, 2013; Drugli, Larsson, Fossum & Mørch, 2010; Scott, 2005), but some studies have failed to support this (e.g., Karjalainen, 2021). Future research should aim to examine longer‐term effects (both primary and derived) of the IYPT for both children and their families.…”