Up to now there has been no comprehensive empirical analysis to support or refute the claims of increasing violence against aid workers relative to their numbers in the field. To address this issue, the Center on International Cooperation (CIC) and the Humanitarian Policy Group (HPG) launched a joint study in 2004 to provide a quantitative analysis of the changing security environment for civilian aid operations, and to examine related trends in security policy and operations over the last decade.
Stoddard, A., & Harmer, A. (2006, September). Providing Aid in Insecure Environments: Trends in Policy and Operations. Humanitarian Policy Group, Briefing Paper 24.