This document is a comprehensive report examining the humanitarian system's effectiveness in addressing the needs of internally displaced persons (IDPs). Authored by Lewis Sida, Erin Mooney, and others, it highlights the growing challenges of internal displacement due to conflict, disasters, and climate change. The review provides insights into protection gaps, IDPs' vulnerability, leadership issues, and offers recommendations to improve responses and ensure timely and holistic solutions. Published in March 2024, it is a critical reflection on global humanitarian practices.