# Phase Signals and Transition Markers

How to tell which phase a startup is actually in, and when it's transitioning.

## Phase I Signals

- User count < 1,000 (soft threshold, varies by product)
- Product still actively being rewritten based on each user conversation
- Customers churn quickly (retention weak)
- Founder can name every customer
- Growth is bumpy and unpredictable
- "Traction goal" would be something like "first 100 paying customers"

## Phase I → II Transition

- Customers start sticking without prompting
- Word-of-mouth begins ("my friend told me about this")
- Founder stops needing to hand-hold every new customer
- Product stops being rewritten at the fundamental level
- Growth rate becomes more predictable month-over-month

## Phase II Signals

- Product-market fit is clear in retention data
- A channel is producing consistent leads
- Team is hiring to scale marketing/sales functions
- Traction goal is something like "reach break-even revenue" or "100k users"
- The question is "how do we grow the channel" not "do we have a channel"

## Phase II → III Transition

- The channel that worked starts to saturate (rising CAC, diminishing volume)
- Growth rate from the primary channel flattens
- Team has resources to pursue multiple channels in parallel
- Market is now aware of the company

## Phase III Signals

- Established business model with known unit economics
- Multiple channels contributing meaningfully
- Growth rate is more about scaling than discovery
- Traction goal is about market share or dominance
- Strategic concerns (competition, category definition) matter more than tactical channel selection

## Common Misdiagnoses

- **Phase I looking like Phase II:** Founder thinks they have product-market fit because a few customers love the product. Check retention: do customers come back, or were those a one-time spike?
- **Phase II looking like Phase III:** Founder thinks they're scaling because revenue grew, but the channel is actually saturating — they just haven't noticed CAC climbing.
- **Phase III looking like Phase I:** Founder acts like a scrappy startup at $10M ARR, refusing to hire scaled marketing. The unscalable tactics that got them here aren't enough anymore.

## Source

Chapter 3 ("Traction Thinking") of *Traction* by Gabriel Weinberg and Justin Mares.