This Participant Roster indicates those participants who signed the Group Participation Agreement (GPA) for the Federation Interoperability group. Habitual non-attenders of meetings are at risk of being declared non-voting (sometimes called being an "observer"). Participants who wish to re-establish voting rights may do so simply by attending a meeting. Participants of all stripes always have mailing-list posting privileges.

Note: Since participants may move between voting and non-voting, and are moved to the second half of the table when they become non-voting (thus removing their record), the attendance record columns do not necessarily reflect actual attendance at any one meeting. Rather, they are a tool to help the chair manage quorum over time.

As of 2 June 2010 (pre-meeting), quorum is 23 of 23.