Six Thinking Hats
Six Thinking Hats: Separate thinking into six modes β White (facts), Red (emotions), Black (risks), Yellow (benefits), Green (creative alternatives), Blue (process). Have all participants wear the same "hat" simultaneously. This eliminates argument and produces more complete exploration of any idea, decision, or problem.
What Is the Six Thinking Hats Framework?β
Edward de Bono introduced Six Thinking Hats in his 1985 book of the same name, drawing on his broader theory of "parallel thinking" β the idea that groups should think together in the same direction rather than arguing from opposing positions.
Traditional debate-style thinking pits people against each other: one person argues for an idea while another argues against it. The result is adversarial, incomplete, and often dominated by whoever is most assertive rather than whose analysis is most accurate. De Bono's insight was that most of the thinking modes in a debate β analysing facts, assessing risks, exploring possibilities, checking emotions β are useful on their own. The problem is that they happen simultaneously and in opposition.
Six Thinking Hats separates these modes and applies them in sequence. When the group is wearing the White Hat, everyone focuses on facts and data β no opinions, no feelings, no risks. When they switch to Black Hat, everyone β including the idea's proponent β looks for risks and problems. This "parallel thinking" means no one is defending a position while others attack it; everyone is thinking the same way at the same time.
The six hats:
- White Hat β Facts, data, information gaps. "What do we know? What do we need to know?"
- Red Hat β Emotions, intuitions, gut feelings. "How does this feel, without justification?"
- Black Hat β Risks, problems, reasons it won't work. "What could go wrong?"
- Yellow Hat β Benefits, value, optimism. "Why this could work; what's the upside?"
- Green Hat β New ideas, alternatives, creative possibilities. "What else could we try?"
- Blue Hat β Process, agenda, managing the thinking. "What thinking do we need next?"
How It Worksβ
Step 1: Define the topic
β Clear problem or decision to explore
Step 2: Assign a sequence of hats
β Common sequences:
β’ New idea: White β Green β Yellow β Black β Red β Blue
β’ Decision: White β Yellow β Black β Green β Red β Blue
β’ Problem: Blue β White β Black β Green β Yellow β Red β Blue
Step 3: Everyone wears the same hat simultaneously
β No debate during each hat phase
β Each person contributes within the current hat's mode
Step 4: Capture outputs under each hat
β Record all contributions per hat
Step 5: Synthesise with Blue Hat
β What did we learn? What do we decide? What next?
Three Real-World Examplesβ
ABB Engineering Design Reviewβ
ABB (the Swiss engineering company) applied Six Thinking Hats to engineering design reviews and reported that meetings that previously took days were completed in hours. The key change: separating the "what could go wrong?" (Black Hat) phase from the "here's our design rationale" (Yellow Hat) phase prevented the adversarial dynamic where designers felt attacked and became defensive, which usually generated more heat than insight.
Creative Sprint at a Marketing Agencyβ
An agency using Six Thinking Hats for a new campaign concept started with White Hat (existing campaign performance data, competitor activity, audience research), moved to Green Hat (unconstrained creative concepts β no evaluation allowed), then Yellow Hat (what's compelling about each concept), then Black Hat (what could go wrong with execution or reception), then Red Hat (gut reactions from the team), then Blue Hat (which concept to develop). The structured separation of creative generation from critical evaluation produced both more ideas and cleaner evaluation.
IBM Management Trainingβ
IBM incorporated Six Thinking Hats into management training programmes in the 1990s, particularly for cross-functional teams. The specific value: Red Hat permission. In corporate settings, expressing "this feels wrong" without rational justification is often suppressed. Red Hat legitimises emotional and intuitive input as a distinct, valid data source β which frequently surfaces concerns that don't yet have articulable rationale but prove accurate.
When to Use Itβ
β Ideal for:
- Group decisions where participants have different roles or perspectives
- Creative sessions where you want both generation and evaluation without conflation
- Meetings that typically become adversarial debates
- Exploring a controversial idea without it becoming personal
β Less useful for:
- Solo thinking (though the mental model of "switching hats" is personally useful)
- Simple decisions that don't warrant structured analysis
- Highly time-pressured situations
| Pairs well with | Why |
|---|---|
| Reverse Brainstorming | Reverse Brainstorming is a structured Green + Black Hat exercise |
| Pre-mortem | Pre-mortem is a focused Black Hat exercise |
| SCAMPER | SCAMPER generates Green Hat content systematically |
| Steel Manning | Yellow Hat = steel manning the opposing view |
Common Misuses and Limitationsβ
Wearing multiple hats simultaneously. The entire value comes from separation. If someone is thinking "this is risky (Black) but we could modify it (Green)" at the same time, the hats aren't working. A facilitator must enforce single-hat thinking during each phase.
Skipping the Red Hat. Red Hat feels soft and unscientific in many corporate cultures, so it gets cut. This is a mistake β gut feelings often encode pattern recognition that hasn't been articulated yet. Suppressing the Red Hat drives emotional content underground into ostensibly rational arguments.
Using it without a Blue Hat facilitator. Without someone managing the process (Blue Hat), groups slip into debate mode. The Blue Hat role is critical β ideally a designated facilitator, not the most senior person in the room.
Forcing equal time on each hat. Some topics need five minutes of Yellow Hat and twenty of Black. Let content requirements drive time allocation, not a mechanical equal split.
Related Modelsβ
| Model | Relationship |
|---|---|
| Reverse Brainstorming | Black Hat thinking applied as a generative technique |
| Design Thinking | Design Thinking uses similar phase separation (empathise, define, ideate, prototype, test) |
| SCAMPER | SCAMPER is a Green Hat tool β structured idea generation |
| Pre-mortem | Pre-mortem is structured Black Hat analysis |
Frequently Asked Questionsβ
In what order should the hats be used?
The Blue Hat always opens and closes the session β it sets the agenda and synthesises the results. For creative sessions, put White before Green (facts first, then ideas) and Black after Yellow (optimism before criticism prevents premature convergence). For decision-making, White β Yellow β Black β Green β Red β Blue works well. De Bono's book provides sequences for various scenarios, but the facilitator should adapt them to the specific situation.
Can individuals use Six Thinking Hats alone?
Yes, and effectively so. Solo hat usage means deliberately switching your own thinking mode: "Now I'll spend five minutes only looking for data gaps (White), then five minutes only thinking about what could go wrong (Black)." The discipline of preventing yourself from blending modes is harder when alone β you need to be your own facilitator β but the value of complete, sequenced exploration applies regardless of group size.
Why does parallel thinking outperform debate?
Debate produces defensiveness: when your idea is attacked, you defend it rather than honestly assessing its weaknesses. Parallel thinking eliminates this by removing the adversarial structure β when everyone is doing Black Hat together, including the idea's proponent, there's no attack-defence dynamic. Research on group decision-making consistently shows that adversarial debate produces less information than cooperative exploration, because participants optimise for winning the argument rather than finding the truth.
Further Readingβ
- de Bono, E. (1985). Six Thinking Hats β the source text
- de Bono, E. (1970). Lateral Thinking β the broader framework from which Six Hats emerged
- Lumsdaine, E. & Lumsdaine, M. (1995). Creative Problem Solving β applied thinking frameworks
Apply with AIβ
π Run a Six Thinking Hats session with MindMax β
This page is part of the MindMax Mental Models Knowledge Base.