This document outlines the Climate Change Science Program Interagency Communications Working Group's (CIWG) implementation plan for calendar year 2005. The CIWG aims to facilitate effective communication between CCSP agencies and the public regarding climate change science. Key functions include media relations, public outreach, and improving CCSP and agency websites. Public outreach efforts will include fact sheets on CCSP, the climate science basics, and quarterly featured research topics. The CIWG will also assist working groups with outreach for new research products and identify opportunities for exhibits and briefings. All communication products require approval from the CIWG and CCSP Principals. The CIWG will evaluate effectiveness and report to the Principals.