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

SKILL.md

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:

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

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)

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

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.

brainstorm-experiments-existing

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