Example of Design Failure
BART “Charge-a-Ticket” Machines
- allow riders to buy BART tickets or add fare
- takes ATM cards, credit cards, & cash
Problems
- one “path” of operation
- ticket type -> payment type -> payment -> ticket
- BART Plus has minimum of $28, no indication of this until after inserting >= $1
- can’t switch to regular BART ticket
- large dismiss transaction button does nothing