Introducing Tracer Studies is based on the experiences of studies that have followed the 'footsteps' of former participants of early childhood programmes. Participants in these programmes included children, adolescents, parents, teachers, community members, and others, and many were followed up between three and 20 years after they had completed a programme. The emphasis in this publication is on the approaches and methods that were used to study programmes, that operate in very diverse settings, have varied programme approaches, target different populations, and have their own unique aims and objectives.