Dark Horse Prototype

Purpose

The Dark Horse Prototype intentionally explores the wildest, most unlikely concept the team can imagine. By prototyping the idea everyone thinks is "too crazy," teams often discover unexpected value, challenge assumptions, and break free from safe, incremental thinking. Even if the dark horse itself isn’t the final solution, it usually shifts the team’s frame.

At a glance

• Group size: 3–8
• Duration: 30 minutes
• Difficulty: Moderate
• Facilitation style: Provocative facilitation, encouraging risk
• Setting: Workshop table with prototyping materials

How to run

1. Review existing concepts (5 min): Look at the ideas the team has already generated. Identify the safe, expected ones.
2. Find the dark horse (5 min): Ask: "What’s the idea we’d never pitch to the client? The one that makes us nervous? The one that breaks the rules?" Choose the most radical concept.
3. Prototype it (15 min): Build a quick, rough prototype of the dark horse concept. Use paper, roleplay, storyboard — whatever is fastest.
4. Present and extract value (5 min): Present the dark horse to the team. Ask: "What’s actually good about this?" "What principle does it reveal?" "What element could we bring into our safer concepts?"

Materials needed

• Prototyping materials (paper, markers, craft supplies)
• Sticky notes for capturing extracted principles
• Whiteboard for the existing concept landscape

Pitfalls & common mistakes

• Playing it safe with the dark horse: If the idea doesn’t make anyone uncomfortable, it’s not dark-horse enough.
• Dismissing it entirely: The point isn’t to ship the dark horse, but to learn from it.
• Not extracting principles: Building it without the reflection step wastes the exercise.
• Ridiculing the idea: Create a safe space. The dark horse needs genuine exploration, not mockery.

Inclusion & accessibility

• Frame the exercise as playful, not judgmental — everyone should feel safe proposing wild ideas.
• Allow multiple formats for the prototype (sketch, verbal description, written scenario).
• Rotate who proposes the dark horse across sessions to share the risk.

Variations

• Dark horse gallery: Each sub-team creates their own dark horse; all are presented and the team extracts principles from each.
• Dark horse + funky prototype: Follow the dark horse with a "funky prototype" that blends dark horse elements with practical constraints.
• Dark horse debate: After presenting, one half of the team argues for the dark horse, the other against.

When NOT to use this

• When the team is already struggling to converge — adding more divergence may frustrate.
• When stakeholders are present who would lose trust seeing an outlandish concept.
• When the project is in late-stage execution and radical rethinking would be destabilising.

Source & further reading

• HPI d.school, Potsdam — Dark Horse prototype methodology
• Meinel, Leifer & Plattner — *Design Thinking Research* (Springer, various editions)
• Lewrick, Link & Leifer — *The Design Thinking Playbook* (Wiley, 2018)