segmentation

# Segmentation Useful segments group people by what they're trying to get done and how they behave — not by age, company size, or industry. Demographics and firmographics are addressable labels you bolt on *after* you've found a real need-and-behavior cluster; they are how you reach a segment, not what makes it one. This skill finds those clusters, sizes and scores them, and picks the one beachhead worth winning first. **Grounded in:** *Crossing the Chasm* — Geoffrey Moore: pick a single beachhead segment instead of boiling the ocean. **Go deeper (The Product Channel):** [How to Create a Customer Persona](https://sidsaladi.substack.com/p/week-21-how-to-create-a-customer) The test for a real segment: **the people in it share a need or behavior such that one product decision serves all of them and would change if you targeted a different segment.** If a single offering satisfies two "segments" equally, they're one segment. ## When to use this - You're entering a market and need to decide which slice to attack first instead of building for "everyone." - Your user base feels heterogeneous and you suspect you're averaging across groups that want different things. - Sales, marketing, and product each describe "the customer" differently and you need one shared map. - You're writing a strategy, GTM plan, or board deck that needs a defensible TAM/SAM broken down by segment. - A feature lands well with some users and flat with others, and you want to know what actually distinguishe...