Pontine Micturition Centre. the part of the brainstem that coordinates the activity of the lower urinary tract.

Procedure Manager Class.

Payload Management Computer, located in the Payload Module, is responsible for command and control of the payload. It communicates with the on-board computer in the Service Module.

Program Management Committee. A management body of the PA Department of Transportation, chaired by the Secretary of Transportation, which includes all Deputy Secretaries, the Chief Highway Engineer, and representatives of the District Offices and the Federal Highway Administration. The Center for Program Development and Management supports this group by developing agendas and making presentations. PMC Approval is required to fund and initiate the development of specified phases of a given project. Typically, meetings of the Program Management Committee are held weekly, and those project or actions that are listed on a published agenda are reviewed and acted upon.

Project Management Committee, the group of people with formal oversight of a project. The chair of a PMC is always an officer of the Foundation. As the PMC has official oversight responsibilities assigned by the Board, its actions are considered to be on behalf of the Foundation, with all the legal protections and responsibilities implied. See ASF Bylaws.

Abbreviation for polar mesospheric clouds.