Choosing Your Customers

If your customer conversations are producing vague, contradictory, or confusing data, the problem is almost certainly not your questions — it is your customer segment. Trying to learn from “everyone” means learning from no one. This chapter explains why narrowing your segment is essential and how to do it.

The Segment Problem

Many founders resist narrowing their customer segment because it feels like they are making their market smaller. But the opposite is true: a narrow segment lets you learn faster, build something people actually want, and expand from a position of strength later.

“Before we can serve everyone, we have to serve someone.” — Rob Fitzpatrick

When your segment is too broad, every conversation produces different data. One person loves the idea, another is indifferent, a third has a completely different problem. You cannot find patterns in this noise, so you cannot make decisions.

Signs Your Segment Is Too Broad

• Every conversation goes in a different direction
• You cannot find consistent problems or needs
• People describe completely different workflows
• You keep getting contradictory feedback
• You do not know who to build for first

Customer Slicing

Fitzpatrick introduces the concept of “customer slicing” — progressively narrowing your customer segment until you find a group with consistent, urgent problems.

The Slicing Process

1. Start broad: “Small businesses”
2. Add a demographic filter: “Small businesses with 10-50 employees”
3. Add a behavioral filter: “Small businesses with 10-50 employees that are actively hiring”
4. Add a situational filter: “Small businesses with 10-50 employees that are actively hiring and currently using spreadsheets to track applicants”

Each slice makes the segment smaller but more specific. When you talk to people in a well-sliced segment, you start hearing the same problems and the same language.

Example: Slicing a Fitness App

• Too broad: “People who want to get fit”
• Better: “People who go to the gym 3+ times per week”
• Even better: “People who go to the gym 3+ times per week and track their workouts”
• Best: “Intermediate weightlifters who track workouts in a spreadsheet because existing apps don’t support their programming”

The final slice describes a group of people who share a specific behavior, a specific frustration, and a specific workaround. You can find these people, talk to them, and build something they will actually use.

Finding the Right Segment

You do not need to guess the right segment from day one. Use your early conversations to discover which segments have the most urgent problems.

Segment Discovery Conversations

In early conversations, pay attention to:

• Who has the most emotional response to the problem? Frustration and desperation are good signs.
• Who is already spending money or time on workarounds? Active spending signals real demand.
• Who reached out to you without being asked? Inbound interest from a specific group is a strong signal.
• Who can you actually reach? A perfect segment is useless if you have no way to find and talk to them.

After five to ten broad conversations, you should start to see which types of people care most. Double down on that segment.

The Who-Where Pair

Once you have a segment, you need to know where to find them. Fitzpatrick calls this the “who-where pair” — knowing both who your customer is and where they congregate.

Building Your Who-Where Pair

Who: Freelance graphic designers who manage their own client relationships

Where:

• Dribbble and Behance communities
• Design-focused Slack groups and Discord servers
• Local design meetups and coworking spaces
• Freelancer subreddits and Twitter design communities

Without the “where,” you have a hypothetical segment. With it, you have an actionable plan for finding conversations.

When to Expand

Once you have dominated a narrow segment — you understand their problems deeply, you have built something they love, and you have a repeatable way to reach them — then you expand. Not before.

“If you aren’t finding consistent problems and goals, you don’t yet have a specific enough customer segment.” — Rob Fitzpatrick

The Expansion Path

1. Nail the first segment: Deep understanding, product-market fit, satisfied users
2. Identify adjacent segments: Who is similar but slightly different?
3. Test the adjacent segment: Do the same Mom Test conversations
4. Expand if the problems overlap: If the new segment has the same core problem, your product may transfer
5. Customize if needed: If the problems differ, treat it as a new segment and learn from scratch

Common Segmentation Mistakes

Mistakes to Avoid

• Demographic-only segmentation: “Women aged 25-35” is not a useful segment. Behavior matters more than demographics.
• Aspirational segmentation: “Enterprise companies” sounds exciting but is too broad. Which enterprises? What department? What problem?
• Segment-of-one: Building for a single company’s needs without verifying the problem is shared.
• Refusing to narrow: “But everyone could use this!” is the battle cry of products that serve no one well.

Key Takeaways

• If your conversations produce contradictory data, your segment is too broad
• Use customer slicing to progressively narrow your segment until patterns emerge
• The best segments are defined by behavior and situation, not just demographics
• Know both who your customer is and where to find them — the who-where pair
• Start narrow, nail the segment, then expand to adjacent groups
• Refusing to narrow your segment does not make your market bigger — it makes your learning impossible