We aim to evaluate the efficacy and effectiveness of the current prototype in delivering measurable change in emotion regulatory practices of children. In collaboration with Committee for Children, we are finalising the analysis of a repeated measures RCT with an active control (total N=134 families). **Collaborators:** Prof Pedja Klasnja (Michigan), Prof Ben Hankin (Illinois), Prof Brett Ford (Toronto), Prof James Gross (Stanford), Committee for Children (Seattle)