Textbook of Usability

The framing effect is the cognitive bias in which equivalent descriptions of the same information produce different decisions. A medical treatment described as "90% survival rate" is chosen more often than the same treatment described as "10% mortality rate" — even though the statements are logically identical.

Kahneman and Tversky's Prospect Theory (1979) provides the theoretical basis: people respond asymmetrically to gains and losses. Losses loom roughly twice as large as equivalent gains, so framing an outcome as a loss makes it feel worse than framing it as a forgone gain.

In interface design, framing affects:

• Error messages ("Save failed" versus "Your work is safe but couldn't be uploaded")
• Confirmation dialogs ("Delete everything?" versus "Are you sure you want to continue?")
• Pricing presentation ("Save $20" versus "Pay $80 instead of $100")
• Opt-in language ("Join our mailing list" versus "Don't miss important updates")
• Privacy notices ("Share your data to personalise your experience" versus "Allow tracking")

Framing can be used ethically (framing safety warnings in the most motivating way) or manipulatively (confirmshaming users who decline). Awareness of framing is essential both for designing clear communication and for recognising dark patterns.