Building Blocks Brainstorm
Unlike traditional brainstorming, this exercise focuses on a single idea and has the group build on it iteratively, brick by brick, until a complete concept emerges.
Structure
Setup
Participants work in groups of 4-8. One person begins with a single seed idea - stated simply and concretely: a solution to a problem, a product concept, a process change. This is the first block.
The Building Process
The next participant takes the seed idea and adds one specific element to it. Not a new idea - a development of the existing one. They name the element they've added and hand off to the next participant.
Example progression:
- "A mobile app to help remote workers stay synchronized"
- "...with a shared dashboard visible to the whole team"
- "...where the dashboard updates automatically from calendar and task tools"
- "...and flags when someone hasn't been seen in the shared space for 24 hours"
- "...with a check-in ritual that takes 30 seconds and uses an emoji scale"
Each addition must genuinely build on what came before rather than redirecting to a new idea. If an addition redirects, the group notes it and the participant tries again.
Facilitation Notes
The facilitator should keep track of the building blocks visually - on a whiteboard or flipchart - so participants can see the structure growing. The final result is a complete, collaboratively built concept that no single person designed.
Timing
10-15 minutes of building, 10 minutes of debrief. One full concept typically requires 6-12 iterations.
How to Teach It
How to Explain It
"One seed idea. Each person adds exactly one block - one specific development, not a new idea. You're building on what's there, not starting over. Watch what emerges when we commit to building together."
Why It Matters
Most group brainstorming produces a list of parallel, independent ideas. Building Blocks Brainstorm produces a single concept that is more developed, more tested, and more collectively owned than any individual contribution would be. The constraint - one addition, building on what's there - models the "yes-and" principle directly in a professional problem-solving context. Participants experience both the constraint (no redirecting to your own idea) and the power (each addition unlocks possibilities the previous contributor couldn't see).
Common Coaching Notes
- Redirect vs. build is the key distinction. "What if we changed the whole thing to..." is redirecting. "And if we added X to what's already there..." is building. Coach participants to notice the difference.
- Trust the process. Groups often want to evaluate before finishing. Hold evaluation until after the building is complete.
- Capture the visual record. The whiteboard of blocks is often the most useful artifact from the exercise - teams can see their collective thinking process.
Debrief Questions
- What did the idea become that you didn't expect?
- When did you have to override your instinct to redirect?
- How does this compare to how your team usually brainstorms?
In Applied Settings
Organizational Context
Building Blocks Brainstorm directly addresses the dominant failure mode of group brainstorming: participants generate lists of independent ideas and then compete to have their individual idea selected. This model produces volume but not development, and it structures collaboration as competition rather than co-creation. Applied improv offers a fundamentally different model - building on shared ideas rather than defending independent ones - that produces more fully developed concepts and greater collective ownership.
Workplace Applications
The exercise is valuable in product development, strategy, innovation, and any organizational context where idea development rather than idea generation is the goal. Teams that adopt the building model often find that the ideas that emerge are qualitatively different from conventional brainstorming outputs: more specific, more practical, more integrated, and more surprising. The exercise also surfaces who the builders are in a team - participants who genuinely add to existing ideas rather than needing to contribute original ones.
Meeting and Workshop Integration
Building Blocks Brainstorm works as a workshop warm-up before a complex strategic conversation, as a problem-solving format in its own right, or as a practice exercise in meetings focused on collaborative design. Teams can run it in 15-20 minutes with a real organizational problem and use the result as input to subsequent planning or decision-making.
Debrief for Transfer
The organizational debrief can make explicit what the exercise models: "What if your team norm was to build on each other's ideas before offering new ones? What would meetings look like? What kinds of ideas would you produce?" This connects the exercise to real meeting practice and cultural norms.
Skills Developed
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1-2-4-All
1-2-4-All is a full-group applied improvisation exercise that structures brainstorming in four quick stages: individual reflection, pairs, groups of four, and whole-group sharing. The format widens participation, speeds up idea generation, and gives quieter participants a defined route into the conversation.
Alternate Uses Test (AUT)
Take an everyday object and list as many different uses for it beyond its intended purpose as possible in two minutes. A daily creativity training exercise from divergent thinking research.
Acceptance
Acceptance is an applied improv exercise in which participants hear a new location, answer together with "Yes, let's," and immediately populate that environment as people or objects inside it. The exercise turns acceptance into visible behavior: participants must receive the new reality, enter it quickly, and adjust when someone else has already chosen the role they wanted.
Advance Jointly
Exercises where teams must move forward together on a task, requiring synchronized decision-making and mutual support.
Machine
Machine is a group exercise in which one player starts a repeating movement and sound, and the rest of the group joins one at a time until the ensemble becomes one interlocking human machine. Each new part has to connect to what is already happening instead of operating as a separate solo. The exercise trains timing, ensemble awareness, physical commitment, and the habit of building something together in full view of the room.
How to Reference This Page
The Improv Archive. (2026). Building Blocks Brainstorm. Retrieved March 17, 2026, from https://improvarchive.org/exercises/building-blocks-brainstorm
The Improv Archive. "Building Blocks Brainstorm." The Improv Archive, 2026. https://improvarchive.org/exercises/building-blocks-brainstorm.
The Improv Archive. "Building Blocks Brainstorm." The Improv Archive, 2026, https://improvarchive.org/exercises/building-blocks-brainstorm. Accessed March 17, 2026.
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