The problem: Most ICPs are based on gut feeling, copied from competitors, or defined once and never updated. Meanwhile, your CRM holds thousands of data points about who actually buys, and who doesn't. The answers are already there. You just haven't asked the right questions yet.

The Approach: Data-Driven ICP Discovery

Start with your closed-won deals and work backwards. Analyze win rates and deal sizes across multiple dimensions. Let the data reveal who your best customers actually are, not who you think they are.

Closed-Won
Deals
→
Analyze by
Dimension
→
Spot
Patterns
→
Define
Your ICP
→
Validate &
Iterate

Step 1: Analyze Win Rates by Dimension

For each of these parameters, slice your deals and compare win rates and average deal sizes. The gaps will surprise you.

Industry

Which verticals close at the highest rate? Which have the largest deals?

Win RateAvg Deal Size

Company Size

What's the sweet spot? Too small = low value, too large = long cycles?

Win RateAvg Deal Size

Job Title / Seniority

Who are the actual buyers? Directors? Engineers? C-suite?

Win RateConversion Speed

Region

Where do you win most? Geographic patterns often surprise.

Win RateAvg Deal Size

Lead Source / Intent

Which sources produce customers, not just leads?

Win RateTime to Close

Channel / First Touch

Direct vs. paid vs. organic: what actually converts?

Win RateCost per Win

Step 2: Spot the Patterns

When you analyze the data across dimensions, clear patterns emerge:

Step 3: Consolidate Into Your ICP

Combine the top-performing segments across all dimensions into a tiered definition:

Prime ICP Best-fit across most dimensions. Highest win rate, largest deals.
Strong ICP Good fit. Strong on key dimensions, may miss on one or two.
Acceptable Moderate fit. Worth pursuing but not prioritizing.
Out of Scope Poor fit based on data. Deprioritize or auto-nurture.

This tiered ICP becomes the foundation for a lead scoring system you can implement directly in your CRM.

Step 4: Validate & Iterate

Your ICP is a living document. It should get sharper over time.

Test

Score recent deals. Does the ICP predict actual winners?

Verify

Ask your sales team: do the data patterns match their experience?

Refine

Recalibrate quarterly as new deals close and the data grows.

What You Get at the End

Documented ICP

Backed by data, not opinions

Scoring System

Ready to implement in your CRM

Quality Baseline

Measure marketing going forward

Shared Language

"This is a Prime lead" and sales + marketing are aligned