Your brainstorm ended with the first idea that looked finished

Marco van Hout · 4 min read

Brainstorms rarely lack ideas. They pick the first one that looks done. A 90-minute plan that starts with silent writing, sends exactly three ideas out of the room and books a checkpoint within 10 working days.

The idea that wins is the one that looks finished

Forty minutes into the brainstorm, someone sketches an idea with a bit more detail than the rest. It has a name and a rough drawing. The room relaxes, and the next half hour goes to improving that one idea. The other forty sticky notes stay on the wall until someone photographs them, and nobody opens the photo again.

The group did not lack ideas. The session let one idea get finished before the others had been looked at. That is a sequencing problem, and you can fix it in the agenda.

Polish ends the conversation early

In September 2026, Harvard Business Review published a yearlong study by Jana Retkowsky, Ella Hafermalz, Marleen Huysman and Daan Odijk on senior creatives running TV and streaming ad campaigns. Generative AI made their brainstorming and visualising faster. It also produced concepts so polished that clients fixed on details that could not be made in real production, and teams lost time reworking ideas afterwards.

Two of the researchers' recommendations apply to any brainstorm, with or without AI: keep several options alive instead of converging on one output, and build in a checkpoint before a concept gets locked in. A confident colleague with a marker has the same effect as a polished AI image.

Give all the rules at once, and let people write first

A study in the Journal of Creativity (May 2026, 311 participants in 52 groups) compared groups that heard the four classic brainstorming rules together with groups that got them one at a time. The number of ideas did not change. What changed was how far people developed their ideas, and those developed ideas were chosen more often for the group's final project. Working anonymously made the effect stronger.

So two choices go into the design. Read out all four rules once, at the start. And have people write ideas alone, without names, before anyone speaks.

A 90-minute brainstorm that keeps options open

For 5 to 12 people. The most common length for sessions designed in Metodic is 61 to 120 minutes, so this fits the slot you probably already have. Each block names what the group should have on the wall when it ends.

0-10 min: one question, four rules

Write one question on the wall, starting with "How might we", plus one real constraint (budget, deadline or audience). Read the four rules together: go for quantity, hold judgement, build on each other's ideas, wild ideas are welcome. Output: the question, visible to everyone.

10-25 min: silent writing

Everyone writes alone, one idea per card, at least 5 cards each. No talking, no names on cards. Output: 25 to 60 cards.

25-40 min: pass and build

Cards move to the person on your left. Each person adds one improvement to at least two cards they received, then passes again. Output: every card has been touched by at least two people.

40-55 min: cluster

The group sorts cards into at most 8 clusters and gives each a plain label. Nobody argues for a favourite yet. Output: labelled clusters, no ranking.

55-70 min: pick three

Everyone gets 3 dots. The top three ideas go forward. The rule for this block: no idea gets developed further, including the popular one. Output: a shortlist of exactly three.

70-85 min: stress-test each of the three

Five minutes per idea, three questions: who has to build it, what does the first version cost, what would kill it. Invite the person who would have to deliver the idea for this block. Output: one risk and one first step per idea.

85-90 min: book the checkpoint

Agree who compares the three again, and when. Output: a date in the calendar and an owner per idea.

Rules you can check afterwards

  • At least 5 written ideas per person before the first spoken one.
  • No idea is sketched in detail before minute 55.
  • Exactly three ideas leave the room. Not one, not seven.
  • Each of the three has an owner and a first step that takes less than a day.
  • The checkpoint is within 10 working days. When an idea is dropped there, write down why in one sentence.

When the room wants to decide today

Someone will say the answer is obvious. Sometimes they are right. Put it on the shortlist and let the stress-test do the work. If it is the best idea, it survives five minutes of hard questions and the checkpoint. If it only looked finished, you find out before anyone has built a slide deck around it.

Where to start

Open Session Studio with your question, your group size and the 90 minutes you have, and ask for a brainstorm that ends with three options and a checkpoint date instead of one winner.

Sources

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