Divergence-Convergence Cycle
Create choices before you make choices
The Divergence-Convergence Cycle is the fundamental rhythm of design thinking: first create choices, then make choices. Divergent thinking opens up possibilities through brainstorming, field observation, and visual exploration. Convergent thinking narrows them down through analysis, prototyping, and collective evaluation. The cycle repeats at different scales throughout a project, from early ideation through final refinement.
Brown emphasizes that both phases require specific tools and discipline. Brainstorming, visual thinking, and storytelling fuel divergence. Post-it note voting (the 'butterfly test'), storyboards, and prototyping drive convergence. The critical insight is that accumulating options is merely an exercise if you never converge, but converging too early kills the creative potential of the process.
The cycle is bounded by deadlines, which Brown treats as structural tools rather than arbitrary constraints. Deadlines force convergence, and an experienced project leader knows how to time them to maximize creative output. Too frequent and they prevent exploration; too infrequent and divergence becomes an end in itself.
- Divergent thinking creates choices; convergent thinking makes choices. Both are essential and must be sequenced properly
- Brainstorming is a structured way of breaking out of structure, and it takes practice to do well
- Building on the ideas of others is the most important rule of collaborative ideation
- The Post-it note embodies the movement from divergent creation to convergent selection
- Deadlines are tools for driving convergence, not arbitrary impositions on creativity
- Diverge with DisciplineUse structured brainstorming with explicit rules: defer judgment, encourage wild ideas, stay focused on the topic, and most importantly, build on the ideas of others. Capture every idea on a separate Post-it note or visual artifact. Aim for quantity.Pro tipThe girls in IDEO's Nike kids product brainstorm generated four times more ideas than the boys because they built on each other's ideas in a serial conversation, while the boys competed to get their own ideas out first.WarningA brainstorming session with people who don't know each other, are skeptical, and lack confidence will generate fewer ideas than individual work. The technique requires trust and practice.
- Use Visual Thinking to Explore IdeasExpress ideas through drawing, diagrams, mind maps, and physical models rather than words alone. Drawing forces decisions that language can defer and reveals both functional and emotional dimensions of an idea simultaneously.Pro tipYou don't need drawing skill. The cocktail napkin sketch that launched the biotech revolution (Cohen and Boyer's bacteria diagrams) was crude but effective. Mind maps, matrices, and rough sketches all count.
- Converge Using Collective IntelligenceUse the butterfly test or similar techniques to extract the group's collective judgment. Display all ideas on a wall. Give each participant a small number of Post-it 'ballot' notes to attach to the ideas they believe should move forward. Let patterns emerge from the collective voting.Pro tipThe process is not about democracy. It's about maximizing the team's capacity to converge on the best solutions through give and take, compromise, and creative combination.WarningDon't let convergence happen through debate or executive fiat. These methods tend to select for the most articulate advocate rather than the best idea.
- Test Through Storyboards and PrototypesCreate storyboards that illustrate the sequence of events a user might experience. Build rough prototypes that make the selected ideas tangible and testable. Use these to evaluate whether the converged direction truly addresses the original design challenge.Pro tipAlternate between divergent and convergent phases at each level of detail. Create alternate scenarios and prototype multiple directions before final convergence.
- Use Deadlines as Convergence ToolsSet deliberate deadlines to force convergence. These are not arbitrary management impositions but structural tools that transform options into decisions. An experienced project leader times deadlines to catch the team at the point of maximum useful divergence.Pro tipIt's unwise to have a deadline every day in early phases, but equally unproductive to stretch to six months. Judgment about timing is one of the most important project leadership skills.
IDEO invited groups of eight-to-ten-year-olds to brainstorm ideas for a Nike kids product. The boys and girls were separated into different rooms. The girls generated over 200 ideas in an hour while the boys barely managed 50. The girls conducted a serial conversation where each idea built on the previous one; the boys competed to get their own ideas out without listening to others.
At the end of a deep research and ideation phase, an entire wall of the project room is covered with promising ideas. Each team member receives a small number of Post-it 'ballot' notes and flutters around the room, attaching ballots to the ideas they believe should move forward. The process reveals which ideas have attracted the most butterflies.
Brown developed this framework from observing thousands of projects at IDEO, where the tension between generating ideas and selecting them is a constant management challenge. The specific tools were refined over decades: brainstorming rules written on the walls of dedicated rooms, the butterfly test invented by IDEO co-founder Bill Moggridge, and the use of Post-it notes as a technology for capturing divergent ideas and then converging on the best ones. The framework also draws on the work of creative problem-solving pioneers Bob McKim (Stanford) and Edward de Bono (lateral thinking).