This book investigates how the internal diversity of United Nations peacekeeping missions influences their operational effectiveness in maintaining peace. The authors, Andrea Ruggeri, Vincenzo Bove, and Chiara Ruffa, utilize a combination of quantitative data analysis and qualitative case studies to examine the structural composition of these missions. They argue that the specific makeup of personnel—ranging from leadership to rank-and-file peacekeepers—serves as a critical, yet previously under-researched, determinant of mission success in conflict zones.

Experts identify this work as a foundational text for understanding the internal mechanics of international peacekeeping operations. Scholars frequently note the rigorous integration of mixed-method research as a standard for future studies in security and conflict resolution.