How Model UN Amendments Work: Friendly Amendments, Unfriendly Amendments, and the Voting Process

A delegate from Nigeria stands, raises a placard, and says, “Point of parliamentary inquiry, is it true the original sponsors have accepted my change?” That moment, when a delegate discovers their change is not friendly, is where the most common procedural confusion in Model UN begins. The rule is straightforward: a friendly amendment is a change all original sponsors of the draft resolution agree to, and it is incorporated without a vote. An unfriendly amendment is one where at least one sponsor objects. It must be debated and voted on by the full committee. The rest of this guide explains how these two amendment types work across the major procedural families, how to propose each one, when a change qualifies as friendly or unfriendly, and exactly how the voting procedure determines passage or failure.

A friendly amendment requires unanimous consent from every sponsor listed on the draft resolution. If even one sponsor refuses, the change is automatically unfriendly and must go to a committee vote. The chair asks the sponsors directly: “Do all sponsors accept this change?” If heads nod or placards stay down, the amendment is merged into the resolution text instantly.

Under THIMUN procedure, the friendly amendment is the only kind that avoids a vote. According to THIMUN Rules of Procedure (2023), the chair must confirm sponsor consent before incorporation. Under Harvard procedure (HMUN 2024), the friendly amendment must be submitted in writing with signatures of all sponsors, and it is automatically adopted without debate or vote. No committee time is spent on it. Under NMUN rules, the same logic applies: if all sponsors sign, the amendment is friendly and merged.

The real UN has no formal friendly-versus-unfriendly distinction. In the General Assembly, every change is voted on unless withdrawn. MUN invented the friendly category to save committee time and reward coalition cohesion. If you are a sponsor, your power is simple: you can block any change you dislike without explanation.

An unfriendly amendment is any proposed change that at least one sponsor rejects. It triggers a full debate and a committee vote. This is the high-stakes mechanism delegates use to challenge a resolution without drafting a competing document.

Under THIMUN procedure (Rule 39, 2023), the unfriendly amendment is debated with one speaker in favour and one against, each limited to one minute. Passage requires a simple majority of members present and voting. Under Harvard procedure (HMUN 2024), the unfriendly amendment requires signatures from 20% of the committee to be introduced. Debate time is two minutes total unless extended by motion, and the voting threshold is a two-thirds majority, higher than THIMUN’s simple majority. Under NMUN rules (2024), the unfriendly amendment needs at least five signatories or 20% of the committee, whichever is greater, and passes with a simple majority.

The voting order matters. In NMUN, amendments are voted on in order of submission, and if two conflict, the one adopted first prevails. In Harvard, the default is also submission order, but the committee can change it by motion. In THIMUN, the chair decides the order, and no secondary amendments are permitted.

Check Sponsor Consent First

You are the delegate of Brazil in a General Assembly committee on climate finance. The draft resolution sponsors are Germany, Japan, India, and Kenya. You want to delete operative clause 3, which ties funding to carbon credit purchases. Approach the sponsors during unmoderated caucus. Germany and Kenya agree. Japan and India refuse. The amendment is unfriendly. Under THIMUN, you need a second delegate as a co-submitter; under Harvard, you need 20% of the committee to sign.

Submit the Change in Writing

Under THIMUN and NMUN, oral amendments are not permitted. Write the exact change on the official form: “Delete operative clause 3, lines 28-32.” Include your name, committee, topic, and the exact text change. Under Harvard, collect the required signatures before the chair will accept the amendment.

The Chair Tests Consent

The chair asks the sponsors publicly: “Do all sponsors accept this amendment?” Japan and India say no. The chair declares the amendment unfriendly and opens debate.

Debate and Vote

Under THIMUN, you get one minute to speak in favour. The chair calls one speaker against, likely Japan or India, also for one minute. Under Harvard, you get thirty seconds, and total debate time is two minutes unless the committee votes to extend. Under NMUN, you get one minute, and the chair may allow up to two speakers for and two against. Then comes the vote. Under THIMUN and NMUN, a simple majority passes the amendment. Under Harvard, you need two-thirds. The amendment fails if it does not reach the threshold. You can withdraw the amendment before the vote; under THIMUN that requires no second; under NMUN, all co-submitters must agree to the withdrawal.

The table below captures the structural differences that determine how amendments play out in committee. The most important distinction is not the voting threshold. It is the frequency of amendments. Under THIMUN, the lobbying phase before debate is designed to merge all blocs into a single consensus resolution. Amendments are rare because the resolution is already a compromise. Under Harvard procedure, multiple competing resolutions are introduced, and amendments are a primary tool for modifying them. The amendment frequency per hour of debate is structurally higher in Harvard-style committees.

Rule Aspect	THIMUN (2023)	Harvard / HMUN (2024)	NMUN (2024)
Friendly amendment handling	Chair asks sponsors; if all accept, incorporated immediately	Must be in writing with all sponsor signatures; automatically adopted	Same as THIMUN; sponsor consent required
Unfriendly signatory requirement	A second is sufficient; no fixed percentage	20% of committee must sign	5 delegates or 20% of committee, whichever greater
Voting threshold for unfriendly	Simple majority	Two-thirds majority	Simple majority
Debate time for unfriendly	1 speaker for, 1 against; 1 minute each	30 seconds per speaker; 2 minutes total debate	1 minute per speaker; up to 2 for and 2 against
Secondary amendments (amendment to an amendment)	Not permitted	Permitted; must be germane to primary amendment	Not permitted
Oral amendments	Not permitted	Permitted only for friendly at chair's discretion	Not permitted
Order of voting on amendments	Chair decides order	Submission order unless committee changes by motion	Submission order; conflict resolved by first adopted
Maximum unfriendly amendments per resolution	No fixed limit; chair discretion	No fixed limit; chair discretion	No fixed limit; chair discretion

Not every change is allowed. Under Harvard procedure, all amendments must be germane, meaning they must stay within the scope of the draft resolution topic. Under NMUN, the chair rules on germaneness. An amendment that tries to introduce a new agenda item or shift the scope of the resolution will be ruled out of order. In THIMUN, the same principle applies through the chair’s discretion: an amendment must stay within the scope of the topic as defined in the conference study guide.

The failure case: you submit an amendment to add a clause about nuclear disarmament to a resolution on ocean plastic. The chair rules it not germane. Your amendment is never debated. You lose committee time and credibility. Check the study guide’s topic description before drafting any amendment. Ask the chair during moderated caucus if you are unsure about scope.

What is the difference between a friendly and an unfriendly amendment in MUN, and how is each proposed, debated, and voted on? The answer is procedural and structural. A friendly amendment requires unanimous sponsor consent and skips the vote. An unfriendly amendment requires at least one sponsor objection and triggers a full committee debate and vote, with thresholds that vary by conference: simple majority under THIMUN and NMUN, two-thirds under Harvard. The preparation steps are identical. Identify the change, check sponsor consent, submit in writing, collect required signatories. But the outcome depends entirely on whether the sponsors hold together or break.

If you are a sponsor on a draft resolution, your power to block a friendly amendment is absolute. Use it strategically. Accept a change that weakens your resolution and you lose the ability to defend against it in debate. Reject a popular change and you force it to a vote where it may pass anyway, and you appear obstructionist. The best time to negotiate amendments is during lobbying, before the resolution is formally introduced.

Who Needs This

This material suits the first-time delegate who has never seen an amendment form and needs to know what to do when the chair says “any unfriendly amendments?” It suits the school faculty advisor who must decide which procedural family their students will face: THIMUN’s rare-amendment model versus the high-frequency amendment environment of the Harvard circuit, and budget training time accordingly. It suits the experienced delegate moving from school to university circuit who needs to know that NMUN allows no secondary amendments while Harvard does, and that the voting threshold shifts from simple to two-thirds.

Who Should Look Elsewhere

It does not suit someone researching the actual United Nations amendment process. The real UN has no friendly-versus-unfriendly distinction, allows oral amendments, and votes by simple majority. MUN amendments are a procedural convention of the simulation, not a reflection of diplomatic practice. A parent evaluating whether MUN teaches real policy negotiation should note that amendment procedure rewards procedural agility, not geopolitical knowledge. The one thing that most often goes wrong: a delegate assumes their amendment is friendly when it is not, wasting committee time on a debate they could have avoided by checking sponsor consent during a two-minute unmoderated caucus.