The evaluation of the PPST will assess both the fidelity of the intervention's implementation, as well as the outcomes of the programme in a randomised controlled trial. Programme facilitators and intervention group participants will provide data for the former. For the outcome evaluation, two types of participants will be recruited who will provide self-report data: primary caregivers (n = 80) and where possible another adult living in the home with this primary caregiver and their selected child (n = 60). This "other adult" data will serve to verify the primary caregivers' self-report data. Both participants will provide demographic information, and report on parenting behaviour and child behaviour. Their data will be analysed separately in intention to treat analyses and secondary analyses which consider moderators of programme effectiveness.