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.

This report focuses on several proposals for a new Authorization for Use of Military Force (AUMF) specifically targeting the Islamic State made during the 113th and 114th Congresses. It includes a brief review of existing authorities and AUMFs, as well as a discussion of issues related to various provisions included in existing and proposed AUMFs that both authorize and limit presidential use of military force. Appendices provide a comparative analysis of similar provisions in new AUMFs proposed in the 113th and 114th Congresses. This report will be updated to reflect congressional activity.