Under Standing Orders (Rule 5.3.2), the Bureau meets in private. The Bureau always seeks to reach decisions by consensus but where a vote is required, members carry one vote for each member of the party or group that they represent. In the event of a tie, the Presiding Officer has a casting vote.
The guidance was agreed by the Parliamentary Bureau in November 2007:
Below is the Good Practice Guidance by the Presiding Officer on Announcements by the Scottish Government: