The movement of children is inevitable as they or their families seek social, educational, and economic opportunities, safety, or a fresh start. Looking at these children as a group allows the collection of data and the creation of strategies to address their needs and vulnerabilities in their places of origin, while in transit, and at their destinations. The Mobile Assessment Tool (MAT) can assist in the documentation of these risks and vulnerabilities by exploring the needs and coping strategies of children along their routes of travel. This report details key elements of and findings from the MAT methodology including ethnographic mapping to determine sub-types of children living there, and collecting data about children’s experiences of migration from home to East Jakarta through individual interviews.