This report report provides a comparative analysis of how the use of the e-"Dear Colleague" system in the House of Representatives has changed between the 111th Congress (2009-2010) and the 113th Congress (2013-2014). This report provides an overview of the data and methodology used to evaluate "Dear Colleague" letter usage, discusses the characteristics and purpose of "Dear Colleague" letters, and discusses questions for Congress and observations on the use of "Dear Colleague" letters as a form of internal communications.