a large company: 1. Task time x frequency x employee’s pay 2. Saving off a few seconds on a task could mean saving hours per week 3. Concrete ROI on better usability 4. ???? 5. PROFIT!!!!
how long repetitive actions take back in the industrial revolution 2. Fitts’ Law allows us to predict the time required to rapidly move to a target area based on distance and size 3. Xerox PARC used principles of Fitts’ Law while toying with ideas for input peripherals like the mouse 4. The research at PARC led to the 1983 book The Psychology of Human-Computer Interaction, which introduced a way to predict task times 5. The Keystroke level-model was developed as an easy way to mark up and calculate task flows 6. A little while ago, some researchers extended the Keystroke level-model to include operators for touch devices
time to within 10-20% of the actual time. It would take testing 80 users to have the same margin of error. • Homing: Moving Hand to Keyboard or Mouse: 360ms • Clicking: the Mouse: 230 ms • Pointing: with the Mouse: 1100ms • Mental Operations: (Deciding what to Do): 1350 ms https://en.wikipedia.org/wiki/Keystroke-level_model
few new operators for taking touch devices into account. • Drag: an item: 2047ms • Homing: switching keyboard mode: 1928ms • Keystroke: on a virtual keyboard: 13ms • Rotate: the device: 474ms • Swipe: on the screen: 384ms • Tap: and element on the screen: 110ms • Zoom: pinch gesture: 527ms http://dl.acm.org/citation.cfm?id=2638532
ms • Pointing: 1100 ms • Mental Operation: 1350 ms Touch Level Model • Drag: 2047 ms • Virtual keyboard: 1928 ms • Rotate: 474 ms • Swipe: 384 ms • Tap: 110ms • Zoom: 527 ms Predicted Time: 2660 ms http://www.measuringu.com/predicted-times.php
ms • Pointing: 1100 ms • Mental Operation: 1350 ms Touch Level Model • Drag: 2047 ms • Virtual keyboard: 1928 ms • Rotate: 474 ms • Swipe: 384 ms • Tap: 110ms • Zoom: 527 ms Predicted Time: 1330 ms http://www.measuringu.com/predicted-times.php
ms • Pointing: 1100 ms • Mental Operation: 1350 ms Touch Level Model • Drag: 2047 ms • Virtual keyboard: 1928 ms • Rotate: 474 ms • Swipe: 384 ms • Tap: 110ms • Zoom: 527 ms https://www.travelocity.com
ms • Pointing: 1100 ms • Mental Operation: 1350 ms Touch Level Model • Drag: 2047 ms • Virtual keyboard: 1928 ms • Rotate: 474 ms • Swipe: 384 ms • Tap: 110ms • Zoom: 527 ms https://www.travelocity.com