This report presents findings integrated from seven databases built by Syrian human rights monitors and one database collected by the Syrian government. The databases collect information about conflict-related violent deaths— killings—that have been reported in the Syrian Arab Republic between March 2011 and April 2013. Although conflict conditions make it difficult to identify an accurate record of events, governmental and non-governmental monitors are persevering in gathering information about killings through a variety of sources and data collection methods. The purpose of the report is to explore the state of documentation, the quantitative relationship of the sources to each other, and to highlight how understanding of the conflict may be affected due to variations in documentation practices.