This document has three primary objectives: 1) identify the needs and activities described in the Strategic Research Plan that are currently being addressed by Federal agencies; 2) coordinate future Federal activities that are guided by and align with the goals of the Strategic Research Plan; and 3) communicate Federal actions on ocean acidification to the public. Implementation of the Strategic Research Plan will be an ongoing, long-term, iterative process to ensure that Federal ocean acidification activities address goals outlined in the Strategic Research Plan. In this ongoing work, the IWG-OA will be vigilant about identifying parts of the Strategic Research Plan not currently being addressed and, when gaps exist, Federal agency members of the IWG-OA will work to address the needs that fulfill their mission.