Longitudinal studies rely on participants being willing to be interviewed repeatedly over the length of the study. Standard Western approaches to recruitment and, more critically, retaining participants are not automatically translatable to research with Aboriginal and Torres Strait Islanders families, so LSIC needed to establish, build and retain the trust of the parents and carers of young children. In this chapter we tell the story of the shaping events and processes that underpin LSIC’s design and purposive methodology. As the first of its kind in Australia and internationally, this methodology was ambitious in its aims and vision.