Purpose
"Small business owners" is not a customer segment you can act on. You cannot walk into a room of them, and any interview findings will be too diffuse to drive product decisions. Customer slicing turns a fuzzy audience label into a precise description paired with a physical or digital location where those people congregate, making outreach concrete and repeatable.
When to Use
- At the start of a new discovery effort when the target customer is described in broad demographic or firmographic terms.
- When interview recruiting is stalling because you cannot find the "right" people.
- When early interviews feel scattered, with participants describing wildly different contexts and needs.
- Before committing to a beachhead market or positioning strategy.
Steps
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Start with your current best guess. Write down the audience label your team uses today, no matter how broad. Example: "HR managers."
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Add behavioral constraints. Ask: "Which HR managers specifically?" Look for behaviors that distinguish your target from the broader group. Example: "HR managers who are currently running a hiring process for technical roles."
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Add contextual constraints. Ask: "In what kind of company or situation?" Narrow by company size, industry, growth stage, or a specific trigger event. Example: "HR managers hiring technical roles at Series A startups that have doubled headcount in the past year."
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Identify the where. For the who you just defined, ask: "Where do these people already gather, either physically or online?" List specific communities, events, Slack groups, LinkedIn groups, forums, conferences, or professional associations. Example: "The People Ops Slack community, SaaStr annual conference, LinkedIn groups for startup HR leaders."
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Test reachability. Try to find five real individuals who match your slice within 30 minutes. If you cannot, the slice is either too narrow or the "where" is wrong. Adjust and try again.
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Validate with three conversations. Talk to three people from the slice. If their problems and contexts are coherent, the slice is working. If their stories diverge wildly, slice further.
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Iterate. Customer slicing is not a one-time exercise. As you learn, you will discover sub-segments within your slice that have meaningfully different needs. Split and re-slice as your understanding deepens.
Tips
- A good slice feels uncomfortably narrow. If it does not make you nervous that you are excluding too many people, you probably have not sliced enough. Narrow slices produce sharp insights; broad slices produce mush.
- The "where" is just as important as the "who." A perfectly defined customer segment is useless if you have no channel to reach them. Always pair the who with a concrete where.
- Use slicing to resolve team disagreements. When the team argues about "who the customer is," the real problem is usually that people are picturing different slices. Make each person's implicit slice explicit, then pick one to start with.
Source
Fitzpatrick, R. The Mom Test (customer slicing and the who-where pair for interview recruiting).
