269 ;;Quote: response delays of more than 2 seconds should occur only after a task closure

270 ;;Quote: most accurate time judgments between 0.6 and 0.8 seconds; detected 10% differences

270 ;;Quote: a specification for response time should include acceptable tolerance values; should be below detectable range

271 ;;Quote: a responsive keyboard (click or force change) indicates responsiveness of the terminal

272 ;;Quote: user interface delays should be brief, simple and standardized; e.g., user id confirmation

277 ;;Quote: a user is captive to the terminal when waiting for a response; more than 15 seconds delay can be demoralizing