Crazy 8s
8 ideas in 8 minutes. Jake Knapp's ideation exercise that forces your team to go beyond obvious solutions through time constraints.
Description
Crazy 8s is a rapid ideation exercise from Jake Knapp's Design Sprint where each participant sketches 8 ideas in 8 minutes on a sheet folded into 8 panels, forcing divergent thinking through time pressure. Its purpose: produce more actionable concepts in a few minutes than two hours of traditional verbal brainstorming. The mechanism is strikingly simple. One A4 sheet, a thick marker, a timer visible to everyone, and total silence. The first 3 or 4 ideas are predictable, the ones everyone would have come up with in a meeting. It is from panel 5 onward that the brain, running out of obvious solutions, starts to improvise. It is like clearing out a closet: everyday items come out first; the forgotten treasures are at the back. Jake Knapp developed this exercise at Google before formalizing it in his book Sprint (2016, over 500,000 copies sold, translated into 20 languages) as the centerpiece of Phase 3 (Sketch) of the Design Sprint at Google Ventures. Crazy 8s neutralizes two enemies of corporate creativity: self-censorship and hierarchy. For 8 minutes, nobody speaks, nobody judges, and the introvert at the back of the room produces as many ideas as the creative director. The dot voting that follows ensures a democratic selection of the best leads. Be warned, however: without a well-formulated design question upfront, you end up with 80 off-topic sketches. And if the facilitator does not hold the frame (silence, timer, zero comments), the most talkative people take over and the exercise loses all its value.
Objectives
- Explore opportunities
- Improve team collaboration
- Foster innovation
- Stimulate rapid creativity
Used by
- -Google (integrated into Design Sprints to generate interface concepts before prototyping)
- -LEGO (conducted 150 Design Sprints in 12 months to transform its approach to innovation)
- -IBM (applied in Design Thinking workshops to explore product solutions with business teams)
Advantages
- 40 to 80 ideas in 15 minutes. More productive than 2 hours of verbal brainstorming where 3 people monopolize the conversation.
- Guaranteed equal voice. Introverts, juniors and non-designers produce as many ideas as the creative director. Forced silence levels the hierarchy.
- Zero tools, zero learning curve. A sheet of paper, a marker, a timer. Usable remotely (Miro, FigJam) or in person without prior training.
- Forces divergent thinking. Time pressure pushes beyond the obvious solutions. It is from box 5 onward that truly original ideas appear.
Limitations
- Drawing anxiety in some participants. Reassure the team: nobody judges artistic quality, only the concept matters. A 30-second warm-up is enough.
- The 8 ideas are sketches, not finished solutions. Crazy 8s opens exploration, it does not conclude it. Plan prototyping afterward.
- Intense cognitive fatigue. Do not chain more than 2 sessions per workshop with a break in between. 8 minutes at full intensity is exhausting.
- Requires a rigorous facilitator. Without someone to hold the timer and forbid comments during the exercise, the talkative people take back control.
How to apply Crazy 8s
- 1
Formulate the design question
Before starting the timer, write a precise question on the board, visible to everyone. Example: "How can we simplify the mobile payment process?" A bad question produces 80 useless sketches. Take 5 minutes to frame it correctly. Output: a clear and shared design question.
- 2
Prepare the materials
Give each participant an A4 sheet and a thick black marker (not a fine pen; details are the enemy of speed). No computers, no phones. For remote sessions, open a Miro or FigJam board with 8 frames per person. Output: everyone is equipped, screens closed.
- 3
Fold the sheet into 8 boxes
Each participant folds their sheet in half, then in half again, then one more time. Unfold: you have 8 rectangles. Some prefer to trace the lines with a marker, others leave the folds as-is. What matters is that the 8 zones are identifiable. Output: a sheet ready with 8 delimited zones.
- 4
Start the timer: 8 minutes, 8 ideas
Display a timer visible to everyone. Clearly announce the rules: 8 minutes, 8 ideas, 1 per box, in total silence. No questions, no comments, no questioning glances at your neighbor. Go. Output: the timer starts, everyone sketches.
- 5
Sketch 1 idea per box, 1 minute per idea
Participants draw one solution per box. Rectangles, arrows, stick figures, 2-3 annotated words if needed. The facilitator can announce each minute ("Next box!") or let everyone manage their own pace. Around box 5-6, the brain moves past the obvious. That is where it gets interesting. Output: 8 sketches per person.
- 6
Cut sharply at 8 minutes
"Stop, put down the markers." Even if someone only filled 6 boxes. Never give extra time. Incompleteness is part of the process: an empty box means the participant pushed to the maximum. The rigor of the timer is what gives the exercise its power. Output: all markers down.
- 7
Display and observe in silence (3 minutes)
Everyone hangs their sheet on the wall or places it on the table. Everyone stands, walks around, and observes the others' sketches for 3 minutes. No comments at this stage, just looking. With 5-10 participants, you have 40 to 80 concepts in front of you. Output: a gallery of ideas visible to everyone.
- 8
Lightning presentation (1 minute per person)
Each participant explains their 8 ideas in 60 seconds max. No justification, no storytelling. Just: "Box 1, I imagined X. Box 2, Y." If someone exceeds 1 minute, the facilitator cuts them off. This is not a pitch; it is a quick share. Output: all ideas understood by the group.
- 9
Silent vote with dot stickers
Distribute 3 stickers (or dots on Miro) per person. Everyone places their votes on the most promising ideas, not necessarily their own. No debate during voting. Output: a visual heat map of the group's preferred concepts.
- 10
Select 2-3 concepts to prototype
Identify the most-voted ideas. Discuss for 5-10 minutes max to choose 2-3 concepts to explore in prototyping. Do not seek perfect consensus: pick the most interesting leads to test. Output: 2-3 concepts selected for the next phase.