Definition
"Get out of the building" is Steve Blank's most famous dictum and the operational core of the Customer Development methodology. It is the instruction to founders that they must leave their offices and talk directly to potential customers, partners, and other stakeholders to test their business model hypotheses — rather than refining assumptions internally.
Epistemological Claim
The phrase is not merely practical advice but an epistemological claim: founders cannot know what customers need by thinking about it. Business model hypotheses are guesses. The only way to convert guesses into facts is to test them against external reality. A founding team that builds product based on internal assumptions is operating as a closed system — becoming increasingly confident about increasingly wrong beliefs.
This insight parallels Boyd's concept of orientation: a mental model that is not continuously updated against reality becomes a liability. Blank's "get out of the building" is the startup equivalent of Boyd's insistence on observation and reorientation — forcing the destruction-and-creation cycle that prevents orientation lock.
In Practice
"Getting out of the building" means:
Significance
The phrase has become shorthand for the entire Customer Development/Lean Startup approach. It captures the methodology's central commitment: empiricism over planning, evidence over assumption, customer reality over founder vision.
Sources: "The Four Steps to the Epiphany" (Blank, 2003), steveblank.com