0.2Divergent vs convergent thinking
The essentials in 30 seconds
- Two distinct phases: diverge (generate without judging), then converge (sort and decide) — never at the same time.
- Early judgment = poison: criticizing during generation censors ideas before they exist.
- Basis of the methods: brainstorming = divergent, sorting/voting = convergent; alternate the cycles while announcing the phase.
Running mini-case — Sara and the meeting that kills ideas
Sara, project manager in a service SME in Algiers, gathers her team about the degrading client welcome. Each proposal — chatbot, coffee corner, SMS reminders — is met at once with « too expensive » or « ridiculous » and everything dies out. She decides to separate the phases: ten minutes to note twenty ideas without commenting, and only then sort by cost and impact.
This same case runs through the course, the diagram, the script and the 48h challenge — a standalone thread for section 0.2.
1. Two phases never to mix
Effective creativity relies on alternating two distinct phases. Divergent thinking: the opening phase, where you generate a maximum of ideas without judging or filtering — you explore widely, you dare, you aim for quantity and originality.
Convergent thinking: the closing phase, where you sort, evaluate and decide — you analyze, select, combine, choosing the best paths critically.
2. The error that kills creativity
The fundamental principle: do not do both at the same time. The classic error is judging while generating (« that will never work », « too expensive ») — early judgment cuts the momentum and censors ideas before they exist.
You cannot press the accelerator and the brake at once. By clearly separating the phases (open without criticism, then close with rigor), you get both more ideas AND better decisions.
3. The foundation of every tool
This is the logic of every tool in this guide: brainstorming is divergent (you generate), sorting/voting is convergent (you select). In a real process, you often alternate several divergence/convergence cycles (the « double diamond » of Design Thinking, level 3).
The golden rule stays the same regardless of the number of cycles: when you open, open without judging; when you close, decide with rigor. Open, then close — never both at once.
🔎 Concrete example — Same topic, two stances
On « improving customer welcome », compare judging-while-generating and separating the phases.
Error: « A chatbot? Too expensive. A coffee welcome? Ridiculous. » (killed at once)
Good reflex: first list 20 ideas without comment, THEN assess cost/impact and choose.Result: by separating, you keep 20 paths instead of 2, often the best.
Reflex: announce « now we open, we'll sort later ».
Section vocabulary
- Divergent thinking
- Opening phase: generate a maximum of ideas without judging or filtering (quantity, originality, exploration).
Simple example: Sara notes twenty client-welcome ideas in ten minutes, with no debate.
What it is not: sorting or criticizing each idea as soon as it is stated.
Reflex: announce « we open, we note everything, we sort afterward ».
- Convergent thinking
- Closing phase: sort, evaluate and decide among the ideas (analysis, critical selection).
Simple example: The team then assesses cost and impact and keeps two paths.
What it is not: keeping all ideas without ever deciding.
Reflex: reserve critical thinking for this phase only.
- Divergent/convergent alternation
- The principle of clearly separating generation time from decision time (never both at once).
Simple example: Ten minutes of silent generation, then ten minutes of displayed sorting.
What it is not: mixing generation and decision in the same exchange.
Reflex: display the current phase: « we generate » or « we sort ».
- Early judgment
- Criticizing an idea during generation; kills creativity by censoring before the idea exists.
Simple example: « Too expensive, ridiculous » thrown at each proposal in Sara's meeting.
What it is not: a rigorous evaluation run after generation, which is useful.
Reflex: postpone every « yes but » to the convergent phase.
- Double diamond
- Design Thinking scheme alternating several divergence/convergence cycles (problem then solution).
Simple example: Open on the welcome problem, pick the angle, open on solutions, select.
What it is not: a single quick sort mistaken for a full process.
Reflex: plan at least one open-close cycle on the problem AND one on the solution.
In practice — Alternating divergence and convergence
- Distinguish the two phases: divergent (open, generate without judging) then convergent (close, sort and decide).
- In the divergent phase, aim for quantity and boldness, with no criticism (judgment comes later).
- In the convergent phase only, evaluate, select and combine the best ideas critically.
- Never mix the two: judging while generating (« that won't work ») kills creativity.
Ready-to-say script — frame the two phases in a meeting (30s)
« For ten minutes, we open: twenty ideas noted without commenting, even wild ones. Only afterward do we close: we sort by cost and impact and we choose. For now, no judgment. »
Say at the start of an idea meeting, displaying the current phase.
Copy-paste template — divergence / convergence canvas
TOPIC (1 sentence): _______________
DIVERGENCE (10 min, no judgment, target ideas): _______________
CONVERGENCE (cost / impact criteria): _______________
RETAINED IDEAS (2-3 max): _______________
NEXT STEP TESTED: _______________Small business / tight budget
Alone or in pairs, with no dedicated room: a sheet split in two columns « we open » then « we sort », with the phone timer.
Algerian SME
Meetings broken up by client calls: impose a strict ten minutes of silent generation on paper before any debate.
In a team meeting
Have people write first in silence (one idea per sticky note) so loud voices don't crush shy ones.
Alone facing a problem
Timer: five minutes of wild ideas with no written censorship, then highlight the three most promising.
✓ Best practices
- Explicitly announce the current phase: « we generate » or « we sort ».
- In divergence, note everything without commenting, even wild ideas.
- Keep critical evaluation for the convergent phase only.
✗ Common pitfalls
- Judging an idea as soon as it's said (« impossible »): momentum breaks.
- Looking for « the » solution right away: you lock into the obvious.
- Mixing generation and decision in the same phase.
Key takeaways
- Two distinct phases: divergent (generate without judging) then convergent (sort and decide).
- Never do both at once: judging while generating kills creativity.
- Divergent phase: quantity and boldness first (sorting comes later).
- Convergent phase: critical evaluation and selection of the best paths.
48h Challenge — apply tomorrow
On 1 real topic (welcome, delay, follow-up), run 10 minutes of pure divergence (20 ideas noted with no debate) then 1 cost/impact sort. Keep 1 path to test.
- I can explain the difference between diverging and converging.
- I can run 10 minutes of generation with no judgment.
- I sorted ideas with criteria and kept 1 path.
Frequently asked questions
Why separate generation from evaluation?
Because these two activities mobilize opposite mindsets and interfere if mixed. Generating requires openness and suspension of judgment; evaluating requires critical thinking and realism. If you judge while generating, as soon as an idea emerges you knock it down, and the brain, anticipating criticism, stops proposing: self-censorship sets in. By clearly separating (« we open and note everything, THEN we'll sort »), you get more ideas and a more lucid evaluation afterward.
Should you always diverge before converging?
In a creative approach, yes: open first (generate widely), close afterward (sort and decide). Starting by converging locks you into the first ideas, the most conventional. That said, you often alternate several cycles: diverge to frame the problem, converge to choose the wording, diverge for solutions, converge to select… The key is, at each phase, to respect the separation.
In a meeting, every idea is killed at once with « too expensive, ridiculous ». What does Sara do first?