Substantive Voting Procedure

In Model UN, substantive voting is the procedure used when a committee decides on matters of substance — primarily draft resolutions, amendments to draft resolutions, and, in some rules sets, directives or communiqués in crisis committees. It is contrasted with procedural voting, which governs motions about how the committee runs (caucuses, closure of debate, adjournment, etc.).

Key features that typically distinguish substantive votes across major rules sets (THIMUN, Harvard/HNMUN, NMUN, UN4MUN):

• Observers cannot vote. Only full member states present in committee may cast a substantive vote. Entities such as the Holy See or Palestine (where seated as observers) abstain by default.
• Abstentions are permitted. Unlike procedural votes, where every present-and-voting delegate must vote yes or no, delegates may abstain on substantive matters. A delegate who declared themselves "present and voting" during roll call forfeits the right to abstain.
• Voting bloc is sealed. Once the chair enters voting procedure, the room is closed: no entry, no exit, no notes passed, and no communication with observers or advisors until the vote concludes.
• Threshold is a simple majority of those present and voting, unless the committee simulates a body (such as the UN Security Council) where vetoes by permanent members apply, or the General Assembly on "important questions" under Article 18(2) of the UN Charter, which requires a two-thirds majority.
• Motions available during voting typically include division of the question, roll-call vote, reordering of draft resolutions, and, in some rules, voting by acclamation.

Amendments are voted on before the draft resolution as a whole. Friendly amendments, where accepted under the rules in use, are incorporated without a vote; unfriendly amendments require a substantive vote. After all amendments are disposed of, the committee votes on each draft resolution as amended.