# North Star Metric Framework

## Definition Template

```markdown
## North Star Metric

**Metric:** [Name of the metric]
**Definition:** [Precise calculation formula]
**Why this metric:** [Connection to business value and user value]
**Frequency:** [How often to measure: daily, weekly, monthly]
**Owner:** [Team or person responsible]

### Supporting Metrics (Input Metrics)

| Metric | Definition | Relationship to NSM |
|--------|------------|---------------------|
| [Metric 1] | [Calculation] | [How it influences NSM] |
| [Metric 2] | [Calculation] | [How it influences NSM] |
| [Metric 3] | [Calculation] | [How it influences NSM] |

### Counter Metrics (Health Metrics)

| Metric | Definition | Threshold |
|--------|------------|-----------|
| [Quality metric] | [Calculation] | [Acceptable range] |
| [Risk metric] | [Calculation] | [Alert threshold] |
```

## Common North Star Metrics by Product Type

| Product Type | North Star Metric | Example |
|--------------|-------------------|---------|
| **SaaS B2B** | Weekly Active Teams | Slack, Notion |
| **SaaS B2C** | Weekly Active Users | Spotify, Netflix |
| **E-commerce** | Weekly Purchases | Amazon, Rakuten |
| **Marketplace** | Weekly Transactions | Mercari, Airbnb |
| **Media/Content** | Weekly Engaged Time | YouTube, Medium |
| **Fintech** | Weekly Transaction Volume | PayPay, Revolut |
