This chapter introduces the Transitional Resilience Index (TRI), a multidimensional measurement tool developed by integrating the BRAVE Theory and the FORGE Model. The TRI fills long-standing gaps in resilience science by offering a standardized, flexible, and scientifically rigorous instrument. The chapter places the TRI within its theoretical background, explains its main domains and scoring structure, and discusses applications for veterans, foster youth, and justice-involved populations. It covers implications for research, practice, and policy, including possibilities for long-term tracking, comparative analysis, and systemic accountability. Future directions focus on empirical validation, expanding populations, digital integration, and global use. The TRI reflects the evolution of BRAVE from a framework to real-world application and measurement, establishing the foundation for resilience to be promoted, assessed, and woven into systems.