We conducted an evaluation on “Building Strong Civil Society Organization and Networking for Sustainable Development”: (CRC CSO) for Plan International Thailand under Sida-funding project. The project’s objective is to support civil society for the better realization of children’s rights in Thailand as enshrined in the Child Right Coalition (CRC) and its Optional Protocols. The project targeted to build the capacity of civil society organizations, and supporting their coordinated and sustained efforts to work together on data collection, information and resource sharing, reporting and advocacy for a common long-term agenda for all children in Thailand full potential, especially for most-at-risk populations, along with capacity building for Plan International’s current implementing partners and meaningful participation of children and youth in child’s rights promotion and protection processes.