How do I record and track Libero replacements?

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Who tracks: the assistant scorer prepares the Libero control sheet before the match and set, records the details of Libero replacements and re-designations, notifies the referees of any fault in a Libero replacement using the buzzer, and signs the Libero control sheet at the end. Libero replacements must be recorded on the Libero control sheet (if one is used) or on the electronic score sheet. They are not counted as substitutions. Where the Libero goes on the sheet (Volleyball Canada): the Libero is recorded on the score sheet with the team roster, not on the special line, and the Libero's number is recorded on the line-up sheet for every set. What to check: Libero replacements are unlimited, but there must be a completed rally between two replacements involving a Libero. At the start of a set the Libero cannot enter until the second referee has checked the line-up and authorized the replacement with a starting player. The Libero may replace only a back-row player. An illegal Libero replacement includes no completed rally between replacements, or the Libero being replaced by a player other than the second Libero or the regular replacement player. Re-designation: the number of the player re-designated as Libero must be recorded in the score sheet remarks section and on the Libero control sheet (or electronic score sheet). Age classifications (Volleyball Canada): 14U and 15U teams may not use a Libero; 16U and 17U teams may use one Libero per set; 18U teams may use up to two Liberos per set. Source: Volleyball Canada 2026-2027 Official Volleyball Rules, Rules 19 and 28.