By Dan R., Jr. Olsen
For pro programmers, explains the entire significant methods to implementi consumer interface administration platforms as instruments to build potent and practi computing device interfaces. presents the most important algorithms and discusses the types fo describing dialogs. additionally compatible as a textbook for a programming c
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Additional info for User Interface Management Systems: Models and Algorithms
Most studies (Potosnak 1986) confirm that the Dvorak keyboard is indeed faster than the QWERTY layout, but some studies do not confirm the 15-20% speed increase figure, suggesting as small incease as 2%. The Alphabetic Keyboard. A different keyboard layout is to place the keys in alphabetical order (with a variety of ways of arranging the alphabet on the keyboard). Studies of the use of alphabetic layouts verus QWERTY suggest that in general those users experienced with a QWERTY keyboard were significantly faster on the QWERTY layout, whilst inexperienced typists showed little difference in speed on either after some initial training.
Bar-code readers are hand-held or surface-mounted devices which take reflectivity mesurements from paper baessd bar codes now found an almost every manufactured object. The device is essentially a wand sewiped across the printed code which is translated into data fed to a host program such as a database. Although quite unlike some of the input devices we have looked at in this chapter, the wand of the bar-coide reader shares many characteristics with lightpens, although bar-code readers are obviously not used for the input of user-defined data, and not used for direct text-entry or positioning tasks.
Ergonomic Keyboards. It is now being recognised that both the QWERTY keyboard layour and the flat, square design of the entire keyboard can be changed to accomodate new knowledge about the most effective typing methods and knowledge about the possible dangers of sustained use of keyboards. We will be looking one of the most common dangers associated with keyboard use, Repetitive Strain Injury in a later section, but there have been a number of keyboard redesigns which aim to to provide comfortable and safe keyboards for users.
User Interface Management Systems: Models and Algorithms by Dan R., Jr. Olsen