Nominal group technique: the four steps, and when to use it

The nominal group technique is a structured group decision method with four steps: everyone writes ideas silently, each person shares one idea at a time round-robin, the group clarifies without debating, then everyone ranks the ideas privately. The private vote is what makes it work. It produces a prioritized list that the loudest person in the room did not decide.

It is called "nominal" because for the first stretch the group is a group in name only. People sit together and do not interact, which sounds like a waste of a meeting and is precisely the point.

What is the nominal group technique?

The nominal group technique, usually shortened to NGT, is a facilitated method for generating ideas and ranking them in one session, designed so that every participant contributes equally regardless of seniority or confidence. It was developed in the late 1960s by Andre Delbecq, Andrew Van de Ven and David Gustafson at the University of Wisconsin-Madison, first for community program planning, and it has been used heavily in health services research ever since because it produces a defensible ranked list from a room of experts who disagree.

The reason it survived while flashier methods came and went is that it attacks two specific, well-documented failures of group discussion rather than trying to make discussion nicer. Both failures are mechanical, and NGT answers them mechanically.

The first is production blocking: in a discussion only one person can talk at a time, so while someone else speaks you are either holding your idea in memory or losing it. The second is evaluation apprehension, which is the polite name for not saying the odd thing in front of your boss. Silent writing removes both at once, because nobody waits and nobody performs.

What are the four steps of the nominal group technique?

1. Silent generation. The facilitator states the question, in writing, where everyone can see it. Participants then write their own ideas privately for roughly five to fifteen minutes. No talking, no comparing, no starting early.
2. Round-robin sharing. Going around the table, each person reads out one idea, which is recorded on a flip chart or shared board verbatim. One idea per turn, then round again, until everyone passes. No discussion at all, including no reactions.
3. Clarification. The group works through the list and asks what each item means. This is a strictly definitional step: you may ask "what does that actually involve?", you may not say "that will never work." Duplicates get merged only if their authors agree they are duplicates.
4. Voting and ranking. Each participant privately selects a fixed number of items, often five, and ranks them. The scores are totaled in the open, and the sum is the group's priority list.

Two rules do most of the work. Round-robin means one idea per turn, not one turn to present everything you wrote; that alone stops the confident person from front-loading the entire list. And the vote is private and written, which means people rank what they actually believe rather than what the room seems to want.

What is the difference between the nominal group technique and brainstorming?

Classic brainstorming is verbal, free-flowing and generative: call out anything, build on each other, no judgment, and the session ends with a wall of ideas and no ranking. NGT is silent, structured and decisive: it ends with a prioritized list. Brainstorming optimizes for volume. NGT optimizes for equity and a defensible outcome.

When should you use the nominal group technique?

NGT is the right tool in four situations, and a poor one outside them.

Use it when seniority is in the room. If a VP and two new hires are choosing together, an open discussion will produce the VP's answer with extra steps. Use it when the topic is contentious and a public vote would cost someone face. Use it when you need the ranking to hold up later, because "we scored it and here are the totals" survives scrutiny in a way "we discussed it and agreed" does not. And use it when the group is genuinely expert and the ideas really are in the room, which is why clinical and policy researchers reach for it so often.

Skip it when the ideas are not in the room. This is the failure worth naming, because NGT is a fair way to rank what people already think, and it has no mechanism for producing anything nobody thought of. Run it with six people who all share the same assumptions and you get a beautifully democratic ranking of the obvious. The method's integrity is not the issue; the input is. Often the best idea is already written down somewhere in an old strategy doc, a support thread or last year's post-mortem, and searching across the places your team actually stores things before the session beats hoping somebody remembers it on the day.

Skip it too when you need range rather than a decision. If the honest problem is that every option on the table is mediocre, ranking them harder does not help. Go generate first with something like SCAMPER or reverse brainstorming, then bring the survivors back to a vote.

How do you run a nominal group technique session?

A 90-minute agenda that works:

• 0 to 10 minutes, frame it. Write the question on the board as a single sentence and check that everyone reads it the same way. Most bad sessions are bad here. "How might we reduce first-month churn?" is answerable. "Churn" is a topic, not a question.
• 10 to 25, silent generation. Everyone writes alone. The facilitator writes too, and enforces the silence, including their own.
• 25 to 50, round-robin. One idea per person per turn, recorded in the author's words rather than the facilitator's summary. Keep going until everyone passes.
• 50 to 70, clarification. Meaning only. The facilitator's whole job in this stretch is killing debate the moment it starts, because debate is how the ranking gets decided before the vote.
• 70 to 85, private vote. Each person picks five and ranks them, 5 down to 1, on an index card or a form. Cards in, totals up on the board.
• 85 to 90, read the result. Publish the totals, note where the group split, and say what happens next and who owns it.

Group size is five to nine. Below five the vote is noise; above nine the round-robin drags and people disengage. If you have twenty stakeholders, run parallel groups and combine the rankings rather than stretching one table.

Remote works, and in one way it works better: a form collects votes faster than index cards and nobody can read the room while voting. Keep the phases strict anyway. The failure mode online is that "silent generation" becomes a Slack thread, and a thread is a discussion, which puts the anchoring right back. Our guide to running a brainstorming session covers the facilitation mechanics in more depth.

What are the disadvantages of the nominal group technique?

Four, honestly:

It needs a facilitator. Somebody has to hold the structure, and the moment the rules soften it degrades into a normal meeting with extra ceremony.

It only ranks what walks in. The method is a filter, not a source. Its output quality is capped by the group's existing thinking, and the cap is invisible from inside the room because the process feels so rigorous.

One topic per session. The structure is built around a single question. Multiple questions mean multiple sessions, and that is a lot of calendar.

A ranked list is not analysis. The totals tell you what the room prefers, not what is true. A group can rank confidently and be wrong together, which is why the winner still deserves a check against real numbers before anyone commits budget to it.

The version that fixes the input problem

Everything NGT does well is a countermeasure to group dynamics, and every one of those countermeasures is unnecessary if the ideas do not depend on the group's confidence in the first place.

That is the shape Brainstormer takes. Type the challenge and the wall fills in about thirty seconds with dozens of genuinely different directions, each tagged with the angle it came from, so nobody has to be brave to put the odd idea up: it is already there, and it belongs to the wall rather than to a person. Nothing is blocked, because nothing is spoken. Nothing is suppressed, because there is nobody to impress. Add the ideas your team already had and yes-and mode builds on them instead of leaving them to compete for airtime.

Then it does the NGT ending automatically. Affinity clustering names the themes, impact versus effort scoring ranks every idea with the reasoning written out, and the team can still dot-vote on the shared wall async, which is the private vote without the index cards. You get NGT's fairness and its ranked list, with the ceiling lifted off the input. For distributed teams, online brainstorming covers how the async version runs end to end.

NGT is not obsolete, and it earns its place any time you have real experts and a real disagreement to settle. Just be honest about which problem you have. If the room holds the answer and you need to surface it fairly, run NGT. If the room does not, no voting procedure will vote one into existence.