// description
In the 6-3-5 method, six participants each write down three ideas on a sheet of paper in five minutes, then pass their sheet to the next person, who builds on or adds to the ideas. After six rounds, the group has generated up to 108 ideas in 30 minutes. The method addresses common brainstorming problems: it eliminates production blocking (only one person can speak at a time), reduces evaluation apprehension, and ensures that quieter team members contribute equally.
// history
Bernd Rohrbach, a German marketing professor, published the method in a 1969 article in the magazine Absatzwirtschaft. The technique gained traction in German-speaking innovation communities and later spread internationally as research into brainstorming's limitations made practitioners look for structured alternatives. Variants include brainwriting pools (shared central pile instead of rotation) and online brainwriting tools.
// example
A creator community runs a virtual 6-3-5 session to generate content ideas for the next quarter. Six community members write three coloring book niche ideas each (wildlife, architecture, food, etc.), then pass their sheets. Each person builds on the previous ideas — "coastal wildlife" becomes "underwater caves," then "bioluminescent sea creatures," then "deep ocean creatures with botanical motifs." By round six, the group has generated highly specific, distinctive angles that no individual would have reached alone.
// katharyne's take
If you run a mastermind, a creator community, or even just collaborate with a small group of peers, this method is absolutely worth trying. The "building on" mechanic is magic — it consistently produces ideas that are more specific and more interesting than anything that comes out of a standard brainstorm. You can run an asynchronous version in a shared doc too, which is great for remote creator groups. I've seen this produce genuinely marketable product concepts in 30 minutes that a solo session would never have reached.
// creative uses
- Run an async brainwriting session in a Google Doc with your mastermind group: create a doc with each person's name as a section header, set a 48-hour deadline, and ask each person to write three niche ideas in their section and build on or riff off all the other sections. The document becomes a collaborative product research asset.
- Use brainwriting for Midjourney style development in a creator community: each member posts one prompt variation in a shared channel, then every other member builds on it with one modification. After three rounds per prompt, you have a collaborative prompt library that's more diverse and developed than anything one person would generate.
- Apply the building-on mechanic to content series planning: write three email or YouTube topic ideas, pass them to a collaborator who builds on each, then pass back. Two rounds of building turns three generic topics into nine highly specific, connected content angles you can actually produce.
// quick actions
- Propose a brainwriting session to your mastermind or creator group this week: one Google Doc, one shared brief (e.g., "new KDP niche ideas for Q3"), everyone adds three ideas and builds on others' ideas within 48 hours. Report back on the results in your next meeting.
- Run a solo brainwriting adaptation: write three ideas, set them aside for an hour, then return and build on each one as if you were a different person — someone more experienced, someone newer, someone from a completely different industry. Three rounds of this produces significantly richer ideas than a single session.
- Create a simple brainwriting template in Notion or Google Sheets with space for 6 contributors × 3 ideas × 6 rounds. Share it with your community as a tool they can use for their own sessions — the act of sharing a process tool positions you as a facilitation resource in your niche.
// prompt ideas
Simulate a solo brainwriting session with me. I'll give you three initial product ideas for [niche]: [list them]. Build on each one — take it somewhere I wouldn't go alone. Then build on your own extensions. Do three rounds of building. By the end, I want ideas that are more specific and more distinctive than where we started.
I want to run an async brainwriting session with my mastermind group. Help me design the brief: one shared Google Doc prompt, instructions for each participant, and a clear 48-hour process for building on each other's ideas. The topic is [your product or content focus]. Make the instructions simple enough that non-technical participants can follow them without a facilitator present.
Take these three Midjourney prompt ideas I've been working with: [list them]. Apply the 6-3-5 building mechanic — extend each prompt in three rounds, each time adding one specific element that shifts it further from the original while keeping it coherent. Show me the evolution of each prompt across the three rounds.