1.1Brainstorming & its rules
The essentials in 30 seconds
- Osborn's 4 rules: quantity over quality, no judgment, wild ideas welcome, build on (« yes, and… »).
- Early judgment kills everything: generate first (divergent), sort after (convergent).
- Framework: a clear topic as a « How might we…? » question, limited time, a facilitator who visibly notes everything.
Running mini-case — Sara, project manager in an SME in Algiers
Sara, project manager in a service SME in Algiers, must find ideas to attract more customers. She gathers six colleagues around the question « How might we attract more customers? » and imposes the 4 rules: quantity, no judgment, wild ideas welcome, build on others. In 15 minutes, the board fills with 40 ideas.
This same case runs through the course, the diagram, the script and the 48h challenge — and continues in 1.2, 1.3, 1.4 and 1.5.
1. A well-known… and poorly practiced method
Brainstorming is the best-known idea-generation method — and often the most poorly practiced. Well run, it is a phase of collective divergent thinking where a group produces a maximum of ideas on a topic.
Poorly run (no rules, with judgment), it bogs down into a sterile meeting where a few dominants talk and ideas are killed at birth. The difference lies in respecting precise rules, first formalized by Alex Osborn.
2. The four golden rules
Quantity over quality: aim for the greatest number of ideas (sorting comes later). No judgment: no criticism during generation (« that's stupid », « impossible » are banned) — early judgment kills momentum.
Welcome wild ideas: bold, even unrealistic ideas open paths and trigger others. Build on others' ideas: the « yes, and… », building on proposals rather than starting from scratch.
3. The framework that makes the difference
Add a practical framework: a clear topic (ideally a « How might we…? » question, section 2.5), a time limit, a facilitator who visibly records everything and enforces the rules.
Brainstorming is not « a meeting where we discuss »: it is a generation machine, governed by rules that protect divergence. Respected, they turn a plain meeting into an explosion of ideas.
🔎 Concrete example — Plain meeting vs idea machine
The same topic, with or without the rules.
Without rules: « We lack customers. » → debate, 3 ideas, judgments.
With rules: « How might we attract more customers? » → 40 ideas in 15 min, no criticism, then sort.Result: the framework turns discussion into mass generation.
Reflex: the facilitator protects « no judgment » at all costs.
Section vocabulary
- Brainstorming
- A collective idea-generation method (divergent thinking) governed by precise rules (Osborn).
Simple example: Sara gathers six colleagues for 15 min and generates 40 ideas without judging.
What it is not: a meeting where each idea is debated and criticized as it comes.
Reflex: announce the 4 rules before starting, and enforce them.
- Quantity over quality
- First rule: aim for the maximum of ideas (sorting comes later); quantity raises the chance of gems.
Simple example: Sara aims for 40 ideas in 15 min, even obvious ones, before any sorting.
What it is not: seeking « the right idea » right away and curbing the flow.
Reflex: set a numbered target of ideas, not quality, during divergence.
- No judgment
- Rule forbidding any criticism during generation, so as not to kill creative momentum.
Simple example: « that's silly », « impossible » are banned while Sara notes everything.
What it is not: letting criticism settle in « to save time ».
Reflex: politely interrupt any criticism: « we note, we sort afterward ».
- Wild ideas welcome
- Rule welcoming bold/unrealistic ideas, since they open paths and trigger others.
Simple example: An unrealistic idea of Sara's triggers an applicable path by rebound.
What it is not: dismissing outright anything that seems unrealistic.
Reflex: note wild ideas first, they unblock the rest.
- Build on (« yes, and… »)
- Rule of building on others' ideas rather than starting from scratch (collective rebound effect).
Simple example: « Yes, and what if we applied it to existing customers? » on a colleague's idea.
What it is not: starting from scratch at each turn instead of building.
Reflex: follow with « yes, and… » rather than « yes, but… ».
In practice — Running an effective brainstorming
- Set a clear topic (ideally a « How might we…? » question) and a time limit.
- Apply the 4 rules: quantity over quality, no judgment, wild ideas welcome, build on others' ideas.
- A facilitator visibly records ALL ideas and enforces the rules (especially « no judgment »).
- Separate the phases: first generate (divergent), and only AFTER sort and evaluate (convergent).
Ready-to-say script — launch a brainstorming (30s)
« For 15 minutes, we generate a maximum of ideas to answer: how might we attract more customers? No criticism, wild ideas are welcome, and we build on each other's. I note everything on the board, we sort afterward. »
Say at the start of the session, then strictly enforce « no judgment ».
Copy-paste template — brainstorming framework
TOPIC (as « How might we…? »): _______________
DURATION: _______________
RULES: quantity / no judgment / wild ideas / build on
FACILITATOR (notes all, regulates): _______________
SORT PLANNED (when, how): _______________Small business (2-3 people)
Even at three: write the topic on the wall, time 10 minutes, note each idea without discussing — the framework matters more than numbers.
Algerian SME
A team mixing juniors and seniors: recall that rank doesn't count during generation, each idea is noted the same.
Remote / hybrid
At a distance: ideas in a shared document visible to all, mics muted during generation, rebound round afterward.
Group with dominants
Two voices monopolize everything: impose speaking turns and combine with brainwriting (1.2) so everyone contributes.
✓ Best practices
- Phrase the topic as « How might we…? » to orient the energy.
- Record everything visibly (board): displayed ideas trigger others.
- Set a short, intense time: the time constraint stimulates.
✗ Common pitfalls
- Letting criticism settle in: « no judgment » is the sacred rule.
- Letting two dominants monopolize (combine with brainwriting).
- Discussing each idea as it comes instead of generating then sorting.
Key takeaways
- Brainstorming is a phase of collective divergent generation, governed by precise rules.
- 4 golden rules: quantity, no judgment, wild ideas welcome, build on others.
- Early judgment is enemy number one: no criticism during generation.
- Practical framework: clear topic, time limit, a facilitator who records everything and enforces the rules.
48h Challenge — apply tomorrow
Run a 15-minute mini-brainstorming on a real topic, with a « How might we…? » question and the 4 rules. Count the ideas: aim for 30 minimum.
- I can cite Osborn's 4 rules without hesitation.
- I can phrase a topic as « How might we…? ».
- I ran (or planned) 15 min of judgment-free generation.
Frequently asked questions
Why are so many brainstormings disappointing?
Because they don't respect the rules that make them effective: judgment creeps in during generation, a few dominants monopolize, there's no framework (fuzzy topic, no time, no facilitator), and generation and evaluation are mixed. The result: few, often banal ideas. The solutions match the rules: strictly enforce no judgment, aim for quantity, welcome wild ideas, build on others, and set a clear framework. You can also combine with brainwriting (1.2) so everyone contributes.
« Quantity over quality » — isn't that producing ideas for nothing?
No, it is the best path to good ideas. Statistically, the more you generate, the higher the chance of gems. The first ideas are the most obvious; it's by continuing beyond, when you think you're dry, that the newest ones emerge. And a mediocre idea can trigger an excellent one by rebound. Seeking quality too early curbs the flow. So aim for quantity without judging during divergence, then apply quality when sorting (level 4).
During generation, a colleague says « that's unrealistic ». What must the facilitator protect first?