Customer Development Methodology — Steve Blank

Customer Development Methodology

Author: Steve Blank URL: https://steveblank.com/category/customer-development/

Summary

Blank’s customer development methodology reframed how startups operate: instead of executing a business plan, startups should search for a viable business model through structured customer interaction. His four-step process (Discovery → Validation → Creation → Building) became foundational to the lean startup movement and modern startup practice.

Key Claims

1. “There are no facts inside the building” — all validation must come from customers
2. Startups are not small companies; they require different methods
3. Over 90% of startups fail due to lack of customers, not technology
4. Business plans become obsolete on first customer contact
5. Hypothesis testing should emulate the scientific method
6. Founders must do customer discovery themselves — cannot delegate

Concepts Referenced

• customer-development
• product-market-fit
• pivoting
• lean-startup
• minimum-viable-product

Backlinks

• customer-development
• founder-led-sales
• jobs-to-be-done
• lean-startup
• pivoting
• recommended-reading
• start-here
• the-startup-lifecycle
• the-validation-stack