<qa>  What is the next stage of the RIGHT TRACKS?Intervention phase The next stage of the RIGHT TRACKS consists in testing the feasibility of the incentive scheme. Similar to baseline, the quality of data from the three sources - accelerometry, parental AST report and child self-report of AST - will be examined. In particular, the validity of parental and child-reported AST will be assessed vis-à-vis accelerometry, currently considered to be one of the gold-standards. However, parental report of AST will be used as the basis of the incentive scheme. Once again, in both intervention and control conditions, there will be a 5 thanks voucher for every child taking part in the measurement procedures, in compliance with the protocol. At the end of the study, a debrief sheet will be handed to all participants, including parents and children, and to the two head teachers. 