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The Department of Homeland Security (DHS) previously invited public comment on an advance notice of proposed rulemaking (ANPRM) for potential revisions to the Chemical Facility Anti-Terrorism Standards (CFATS) regulations. The ANPRM provided an opportunity for the public to provide recommendations for possible program changes. DHS is reviewing the public comments received in response to the ANPRM, after which DHS intends to publish a Notice of Proposed Rulemaking.  In addition, DHS intends to publish a notice announcing the availability of a retrospective analysis of the data, assumptions, and methodology that were used to support the 2007 CFATS interim final rule.  The intent of the retrospective analysis is to determine the most accurate assessment of the costs and burdens of the program and to update or confirm previous cost estimates based on observed data from the operation of the CFATS program since 2007.