ACL conferences work with a three-tiered program
PC Co-Chairs, Area Chairs or Senior PC Members, and regular members of the PC.
The conference proceedings should list the PC Co-Chairs, the Area Chairs, or Senior PC Members, the Members of the Program Committee, and any additional reviewers who contributed to reviewing papers, using the headings "PC Co-Chairs", "Area Chairs" or "Senior PC Members", "Program Committee Members", and "Additional Reviewers". The names and affiliations for PC Chairs, Area Chairs or Senior PC members, and PC members should be given in the proceedings. For additional reviewers, only the name is given. All lists should be compiled in alphabetical order.
Each regular PC member is in charge of the review of 5-10 papers, whereas an additional reviewer reviews at most 2 papers. In the unlikely event that a reviewer is asked to review 5 or more papers he or she may, at the discretion of the Program Co-chairs, be upgraded to the status of a regular PC member. This upgrading process must be triggered by the PC member who allocated so many papers to a single reviewer, by a suitable suggestion to the Program Chair.
PC members may recruit additional reviewers, but the responsibility to get adequate reviews for the allocated papers remains with the PC members. The PC members report to the Area Chairs or Senior PC Members, and they in turn report to the PC Co-chairs. Additional reviewers report to the PC member who recruited them.
Only the PC Co-Chairs and Area Chairs or Senior PC Members can be reimbursed for attending the PC meeting. If individual PC members want to attend the PC meeting, they may do so, but on their own expense. Reviewers cannot attend the PC meeting.