There are two reciprocal reviewing requirements: a 'per-submission' requirement, and a 'per-reviewer' requirement. The submission form will allow submitters to designate an author to fulfill the per-submission requirement, or to indicate that the submission is exempt from the requirement. Multiple submissions cannot have the same reciprocal reviewer, unless all other authors do not qualify or are serving in other roles. Any author with 4 or more submissions will automatically be added to the reviewer pool, unless they are already part of the program committee or the COLM organization. Why are we doing this? COLM is fairly new, so we do not have reliable estimates of reviewing need. We are preparing a large and high quality program committee. In the event that our estimates are too low, we are also preparing to scale the committee with the number of submissions by requiring reciprocal reviewing.