Private Sector Preparedness : Hearing Before the Ad Hoc Subcommittee on State, Local, and Private Sector Preparedness and Integration of the Committee on Homeland Security and Governmental Affairs, United States Senate, One Hundred Tenth Congress, First Session: June 21, 2007, Part 1: Defining the Problem and Proposing Solutions: July 12, 2007, Part 2: Protecting Our Critical Infrastructure