brainstorm-experiments-existing Checked

Design experiments to test assumptions for an existing product — prototypes, A/B tests, spikes, and other low-effort validation methods. Use when validating assumptions, testing feature ideas cheaply, or planning product experiments.

Design experiments to test assumptions for an existing product — prototypes, A/B tests, spikes, and other low-effort validation methods. Use when validating assumptions, testing feature ideas cheaply, or planning product experiments.

Design Experiments (Existing Product)

Design low-effort experiments to test product assumptions before committing to full implementation.

### Context

You are helping a product team design experiments for **$ARGUMENTS**. The team has a feature idea and assumptions that need validation.

If the user provides files (PRDs, assumption lists, designs), read them first.

### Instructions

The user will describe their idea and assumptions. Work through these steps:

1. **Clarify the idea and assumptions**: Confirm what the team wants to build and what they need to validate.

2. **Suggest experiments** for each assumption. Consider methods like:

• First-click testing or task completion with a prototype
• Feature stubs or fake door tests
• Technical spikes
• A/B tests on production (with risk mitigation)
• Wizard of Oz approaches
• Survey-based validation (behavioral, not opinion-based)

3. **Key principles to follow**:

• Measure actual behavior, not users' opinions
• Test responsibly — don't put users or the business at risk
• For production tests (e.g., A/B tests), explain risk mitigation strategies
• Aim for maximum validated learning with minimal effort

4. **For each experiment**, specify:

• **Assumption**: What do we believe?
• **Experiment**: What exactly will we do to validate it?
• **Metric**: What will be measured?
• **Success threshold**: The expected value if we are right

Think step by step. Present experiments in a clear table or structured format. Save as markdown if substantial.

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### Further Reading

• Testing Product Ideas: The Ultimate Validation Experiments Library
• Assumption Prioritization Canvas: How to Identify And Test The Right Assumptions
• What Is Product Discovery? The Ultimate Guide Step-by-Step
• Continuous Product Discovery Masterclass (CPDM) (video course)