A natural starting point is the most essential input device for a computer since the 1960s, also one of the most researched piece of interactive technologyThere’s not a single mobile device without a keyboard, soft keyboard or physical one with real buttons
In practice, PC is still better by a factor of two!We find similar differences to PC inReading from display – 1,5Target acquisition – 2-3Menu performance – 1,5-3GIVEN THAT KEYBOARD SIZE IS SMALLER BY A FACTOR OF 10 AND DISPLAY SIZE BY A FACTOR OF 6, THIS IS ACTUALLY REMARKABLE THAT THE DIFFERENCE ISN’T MORE!Half-QWERTY (one-handed) 35 wpm Chord keyboard (one-handed, Stenograph, Palantype) 250-300 wpm  Twiddler keyboard 60 wpm T9 9-20 wpm T9 20 wpm  Reduced QWERTY 23 wpm (half of normal) Handwriting on a PC 24 wpm  T9 and joystick-based EdgeWrite 16 wpm Full-QWERTY 15 wpm Touchpad-QWERTY 13 wmp Physical ITU with no prediction 8 wpm One-handed thumb/two-handed index finger: ITU-12, 21-27  with predictive T9: 46 wpm 
-50% in text entry-40% in menu selection
NOT a single study where no effect reportedObstacle course
MFI shows that performance decreases…The method is lightweight, it takes only about one hour to run and you can use it in the lab to evaluate practically anything
With 5.1 letters per word
20-40% decrease due to manual multitasking
People don’t do long, complex things with mobile devices, even the smartphones. They do brief things, check email, find something etc.
What mobile interactive computers COULD be?Calling (recent study) with 3 smparthones -> 1 minutes for a noviceCapturing and sending an image to Facebook, 1.5 minutesLooking up wikipedia entry related to a place: 1 min
Are the ”multimodal UI” researchers doing it the wrong way? Vocabulary learning?