World Developer Docs

Track only what answers critical product questions—nothing more.
This page shows you what to measure, why, and how to start in one sprint.

1 · Mental Model Q → M → E

Question → Metric → Event

Question you want answered
Metric that quantifies it
Event (or two) that feed that metric

Product Question	Metric (M)	Minimal Events (E)
Do users see value on day 0?	Conversion to First Value	`signup`, `first_value`
Do they come back?	D1 / D7 Retention	`app_open`
Will growth be organic?	Invite Acceptance Rate	`invite_sent`, `invite_accepted`
Can we re‑engage them?	Push Open Rate	`notification_open`

If an event doesn’t roll up to a key question, skip it.

2 · Core Event Set (6 Lines of Code)

track('app_open') // every launch
track('signup', { method: 'id' })
track('first_value', { action: '🎉' })
track('invite_sent')
track('invite_accepted')
track('notification_open')

That is enough to build funnels, retention, and viral metrics.

3 · Action Plan

Focus on these 4 metrics weekly until they’re all green:

Signup → First Value % (target: ≥40%) - Are users getting value immediately?
D1 Retention (target: ≥25%) - Are they coming back the next day?
Invite Acceptance % (target: ≥15%) - Is word-of-mouth working?
Push Open % (target: ≥15%) - Can we re-engage users?

Next steps: Pick the lowest metric and spend 1-2 sprints fixing it. Don’t touch anything else until all four are hitting targets.

4 · Common Pitfalls to Dodge

Event sprawl – >10 events = analysis paralysis.
Vanity charts – page views ≠ value.
No cohorts – averages hide churn.
Premature segmentation – wait for 1k users.
Ignoring retention – acquisition is useless without it.

Analytics should light the path, not become the journey. Keep it lean, learn fast, and build what moves the needle.

Introduction

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Technical Reference

Migration

Further Reading

Data & Analytics

1 · Mental Model Q → M → E

2 · Core Event Set (6 Lines of Code)

3 · Action Plan

4 · Common Pitfalls to Dodge

​1 · Mental Model Q → M → E

​2 · Core Event Set (6 Lines of Code)

​3 · Action Plan

​4 · Common Pitfalls to Dodge

1 · Mental Model Q → M → E

2 · Core Event Set (6 Lines of Code)

3 · Action Plan

4 · Common Pitfalls to Dodge