🔳 Diverge vs. Converge — The Double Diamond
Every high-performance creative session works in two distinct and incompatible modes: divergence (expand the range of possibilities, generate volume, suspend judgment) and convergence (filter, evaluate, select). Mixing the two at the same time is the number one cause of mediocre sessions. The British Design Council formalized this in the Double Diamond in 2005, a model that became a global benchmark.
The most common mistake in corporate workshops is walking into the room with the solution already decided and using the creative session only to validate it. That's the opposite of divergence. Truly disagree means accepting that the best idea doesn't exist yet, that it will emerge from volume and unlikely combinations, and that the facilitator needs to protect this space from premature judgment. Stanford d.school research with 2,200 participants showed that teams that respected the diverge/converge separation generated 3.4x more useful ideas than groups that mixed the modes.
🔳 Divergent Mode
- •Quantity over quality
- •Suspended judgment — NO criticism
- •Wild ideas are welcome
- •Build on other people’s ideas (yes, and)
- •Without hierarchy — job title doesn’t count here
🎯 Convergent Mode
- •Clear evaluation criteria defined in advance
- •Impact, feasibility, and alignment analysis
- •Systematic Reduction of the Option Space
- •Voting, matrix, ranking
- •Documented collective decision
🧠 Rules for a Good Brainstorming Session (Alex Osborn)
Alex Osborn, co-founder of the BBDO advertising agency, coined the term brainstorming in 1939 and published the definitive rules in “Applied Imagination” (1953). His central insight was that group creativity is systematically sabotaged by premature judgment. Osborn’s 4 rules aren’t suggestions: they’re deliberate constraints that recreate the cognitive conditions for divergence to happen. MIT Sloan studies confirm that groups that follow Osborn’s rules rigorously generate 62% more ideas per hour than groups without structure.
Defer judgment
No criticism during generation
This is the hardest rule and the one most often violated. The human brain automatically evaluates every idea in milliseconds. Saying that evaluation out loud—even with a simple “yes, but...” — interrupts the other participants’ creative flow. Neuroscience explains: the amygdala activates social defense mode when there is criticism, suppressing the prefrontal cortex that generates free associations. The facilitator must be rigorous: no “that won’t work,” no negative body language, no awkward silence after an idea.
Seek quantity
Volume and strategy, not the shortcut
Osborn said, “quantity produces quality.” The data confirms it. Linus Pauling, the only person to win two unshared Nobel Prizes, said, “The best way to have a good idea is to have lots of ideas.” A classic study by Robert Weisberg (1999) showed that the best ideas tend to emerge in the second and third thirds of a session, not at the beginning. The minimum target for a 60-minute brainstorm with 6 people: 80 to 100 ideas. If you get fewer than that, the group stopped too soon.
Encourage wild ideas
What’s impossible today becomes normal tomorrow
Ideas that seem absurd serve two critical functions: (a) they break the dominant frame, forcing the group to see the problem from another angle; (b) they inspire more viable modified versions. The idea of "paying for music with attention, not money" was wild in 1999—today, it's Spotify's model. IDEO uses the exercise "How would Disney solve this?" or "How would an astronaut do it?" to force radically different frames.
Combine and refine ideas
1 + 1 = 3 when ideas collide
Combining ideas is the richest source of innovation. Arthur Koestler called this "bisociation"—the collision of two incompatible frames that generates something new. WhatsApp combined SMS (asynchronous communication) with the internet (free of charge) and destroyed an industry. The facilitator should actively encourage: "Does anyone want to build on this idea?" and "How could we combine this with that?"
💡 Facilitator's Role
A brainstorming facilitator isn’t a participant—they’re the keeper of the rules. Their responsibilities: clearly define the ideation challenge before the session (a good “How might we...?” question is worth its weight in gold); time 5–8-minute sprints; capture all ideas visually (sticky notes, whiteboard); step in when someone criticizes; re-energize the group when momentum drops with provocations (“What if this were 10x bigger?”, “How would a competitor do it?”). Amazon uses “silent brainstorming” in all its innovation meetings: 15 minutes of individual writing before any group discussion.
🔎 SCAMPER — The 7 Lenses of Creativity
SCAMPER is a creative question checklist created by Bob Eberle in 1971, based on Alex Osborn's work. The acronym represents 7 action verbs that serve as cognitive lenses to force the brain to see a product, service, or process from angles it hasn’t explored spontaneously. Unlike free-form brainstorming, SCAMPER is structured and systematic: ensures you explore dimensions you would normally ignore. Companies such as Google, 3M, and Procter & Gamble have incorporated SCAMPER into their product innovation processes with documented results.
S — Substitute
What can be swapped? Component, material, process, person, place, rule.
Ex.: Netflix replaced physical DVDs with digital streaming
C — Combine
What can be combined? Functions, purposes, steps, product categories.
Ex.: A smartphone combined a phone + camera + GPS + computer
A — Adapt
What can be copied or adapted from another context? What analogies work?
Ex.: Velcro was adapted from the way seeds stuck to dog fur
M — Modify
What can be amplified, reduced, distorted, exaggerated? Shape, color, sound, frequency.
Ex.: Red Bull adapted a Thai energy drink for the Western market
P — Put to another use
What other uses does it have? Who else would find this useful? In another market, context, or segment?
Ex.: WD-40 was created for rockets — it became a billion-dollar household product
E — Eliminate
What can be removed? Which step is unnecessary? What happens if you simplify radically?
Ex.: Apple eliminated the physical keyboard and created the touchscreen iPhone
R — Revert
What happens when you reverse the order? Rearrange it? Do the opposite? Turn it upside down?
Ex.: Amazon reversed "the customer goes to the store" to "the store goes to the customer" (Prime)
Each letter = a warm-up question. Use all 7 before judging any answer.
📄 How to Use SCAMPER in Practice — Session Guide
📝 Brainwriting and 6-3-5 — Anti-Groupthink Techniques
Classic verbal brainstorming has a documented problem: social dominance. Whoever speaks loudest, gets there first, or holds the highest position dominates the session. Brainwriting solves this: each participant writes down their ideas individually, in silence, before any discussion. The most famous and powerful variation is 6-3-5 (also called 635 Brainwriting), developed by Bernd Rohrbach in 1969. A study at Indiana University compared groups using brainwriting versus verbal brainstorming: the brainwriting group generated 71% more unique ideas in the same time frame.
⚙ How 6-3-5 Works
Mechanics: Each participant gets a sheet with 3 columns and 5 rows. For the first 5 minutes, they write 3 ideas in the first row. At the facilitator’s signal, they pass the sheet to the right. For the next 5 minutes, they read their neighbor’s ideas and write 3 new ones—which can be original or variations/combinations of the ones they received. Repeat for 5 rounds. Result: 108 ideas in 30 minutes (6 x 3 x 6—some repeated, but the density is impressive).
Digital version: With remote teams, use Miro or FigJam with columns of virtual sticky notes. Each person has their own column. Use a shared timer. The "rotation" becomes "read the column on your left and add to your own." The anti-groupthink effect remains.
✓ Advantages of Brainwriting
- ✓ Introverts contribute equally — without pressure to speak
- ✓ Job title doesn’t matter—ideas appear anonymously
- ✓ There is no "anchor" — the group doesn't converge around the first idea
- ✓ Other people's ideas inspire unexpected connections
✗ When NOT to Use It
- ✗ Teams with low levels of written literacy or who speak a different language
- ✗ Problems that require rich discussion before ideation
- ✗ Groups smaller than 4 (they lose the rotation effect)
- ✗ How to use it as a standalone method — use it in combination with discussion
🎯 Prioritizing Ideas — Impact x Effort Matrix and Dot Voting
After generating 100+ ideas, the group needs to converge. Choosing the prioritization method is just as critical as generating ideas: a poor method discards gold and selects mediocre ideas. The two most proven frameworks are the Impact x Effort Matrix (also called the Eisenhower innovation 2x2) and the Dot Voting (democratic voting method using sticky dots). Google Ventures popularized a variant of dot voting called "Heatmap" in its 5-day Design Sprints.
📈 Impact x Effort Matrix
Draw a 2x2 grid: horizontal = Effort (low to high), vertical = Impact (low to high). Place the ideas in the corresponding quadrant. The 4 quadrants translate into strategies:
🔶 Dot Voting
Each participant gets N points (typically 3 to 5, depending on the number of ideas). In silence, everyone distributes their points among the ideas they find most promising. You can put all your points on one idea or spread them out. Critical rule: voting is in silence and simultaneously — not sequential. This prevents people from voting for whoever voted before them (the bandwagon effect).
💡 Tip: Separate criteria before voting
Before any vote, collectively define the selection criteria (e.g., “Alignment with the strategy,” “Feasibility in 3 months,” “Potential customer impact”). This keeps the decision from being based on personal preferences or familiarity. McKinsey recommends no more than 4 criteria—more than that creates paralysis and conflicts over weighting.
🚨 Pitfalls — Judging Too Early, HiPPO, and Anchoring
Knowing the techniques isn’t enough. Ideation sessions fail mainly because of cognitive biases and group dynamics that creep in silently. The three most dangerous and well-documented are: premature judgment (killing ideas before developing them), the HiPPO effect (Highest Paid Person's Opinion — the boss's idea wins because of power, not merit) and anchoring (all ideas gravitate toward the first one suggested). Identifying and neutralizing these three patterns is what separates an average facilitator from an excellent one.
⚠️ Trap 1: Premature Judgment
Premature judgment doesn’t show up only as explicit criticism (“that will never work”). It disguises itself in subtler forms: silence after an idea (the group interprets it as disapproval), technical questions (“How much would that cost?”), negative comparisons (“Company X already tried that”), and language that signals doubt (“I’m not sure...”). The facilitator needs to train the group to use the formula "Yes, And..." instead of “Yes, but...” — one word completely changes the dynamic. Theater improv studies (which use the same technique) show that groups trained in “Yes, And” generate 40% more ideas per session.
Language that kills
- ✗ “Yes, but that would never scale...”
- ✗ “We tried that in 2018...”
- ✗ “The legal department would never approve...”
- ✗ (silence + puzzled look)
Language that builds
- ✓ “Yes, and we could also...”
- ✓ “Interesting! What if it were for another segment?”
- ✓ “Which part of this seems most promising to us?”
- ✓ “How could we make this viable?”
⚠️ Trap 2: HiPPO Effect
HiPPO = Highest Paid Person's Opinion. When the CEO, VP, or most senior leader suggests an idea, the group unconsciously converges around it—even without data, evidence, or testing. A 2017 Harvard Business Review study of 500 corporate teams found that 74% of ideas selected in unstructured innovation sessions were ideas originally proposed by the most senior member present. The antidote: the facilitator must ensure that the senior leader speak last (technically called “closing the loop”), and that votes be anonymous and simultaneous.
💡 Anti-HiPPO Protocol
Before the session, the facilitator asks the senior leader to save their ideas for last and vote silently along with everyone else. The leader should be briefed on the reason: “Your influence is valuable in the decision phase, not the generation phase. Ideas generated in a free environment produce 3x more innovation.” Pixar uses a variation of this in its “Braintrust sessions”—the film director listens; they don’t decide.
⚠️ Trap 3: Anchoring
Anchoring is the cognitive bias described by Kahneman and Tversky (Nobel Prize in Economics, 2002): the first information presented acts as an anchor and distorts all subsequent evaluations. In ideation sessions, the first idea spoken aloud becomes the group’s unconscious point of reference. Subsequent ideas become variations on it, not radically different alternatives. The result: premature convergence disguised as diversity. Operational antidote: use brainwriting for the first round (everyone writes simultaneously, without hearing one another), reveal all the ideas at the same time, and shuffle them before presenting.
📋 Facilitator Checklist — Before Getting Started
📋 Module Summary
Next Module:
2.5 - Jobs To Be Done: understanding what customers are really hiring a product to do when they buy it