Skip to main content
Dictionary
Store
Blog
World
Help
Advertise
Chat
System Status
Information Collection Notice
Trademark Concerns
reCAPTCHA Privacy
Terms of Service
reCAPTCHA Terms
Privacy Policy
Accessibility
Report a Bug
Data Request
Contact Us
Security
DMCA
© 1999–2026 Urban Dictionary ®
Mugs
Tees
Hoodies
Pro Customization
Create unique products with your own words and definitions
Preview
Personalize Your Design
Your Word
Your Definition
The problem of external validity (the "lab vs. world" gap). Controlled studies, especially randomized controlled trials (RCTs), are the gold standard for establishing causality. But to achieve control, you must isolate variables in an artificial, simplified environment. The hard problem is that this very act of control often strips away the real-world context, complexity, and interactions that determine how a treatment or phenomenon actually functions in the wild. What works perfectly in a double-blind RCT might fail or cause harm in a messy society because people aren't lab rats and the world isn't a sterile cage.
Text fits
Save
Cancel