LORROS determines a quorum to be 50% of the total number of group voting members plus one (for an even number of members) or one half (for an odd number of members).
All group members are being sent emails during the meeting so LORROS assumes that all group members are participating in a meeting. If you have opted out, you are still considered to be participating (see Muting Messages).
However, the only way for LORROS to know for sure if a group member is participating is through the voting on motions. Therefore, unlike conventional meetings, quorum is not set for the whole meeting but rather for each motion. For example, during a meeting a quorum of members may have voted on one motion but not on another. LORROS then records the former motion to be valid and the latter motion to be invalid.