The document describes the development of the Child Status Index (CSI), a tool designed to improve assessment of highly vulnerable children in low and middle income countries. The CSI was created through a collaborative process involving community participation. It assesses children across 12 factors related to nutrition, shelter, health, education and more. Each factor is rated on a 4-point scale from good to very bad. The CSI allows for individualized assessment of children's needs and monitoring of outcomes over time at the community level. It represents a shift away from "one-size-fits-all" approaches to assessment.