---
title: "A/B Testing"
type: concept
tags: [experimentation, testing, statistics]
sources: [project-management-experiment-tracker]
last_updated: 2026-04-20
---

## Definition
A/B Testing is a controlled experiment that compares a control variant against one or more treatments to measure causal impact on a target metric.

## Core Principles
- Randomly assign users to variants
- Change one meaningful variable at a time when possible
- Predefine primary and guardrail metrics
- Run long enough to reach adequate sample size
- Analyze results with statistical rigor

## Related Entities
- [[Experiment Tracker]]
- [[Senior Project Manager]]