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Additional info for Introducing Systems Design
The process of prototyping also gave software developers a more realistic feel for the amount of efIort required to add features to a project, and the lack of definitive specmcation meant that prototypes were less loaded into a set of promises to deliver capabilities than the specmers. • Prototyping did not tend to produee higher productivity if productivity is measured in delivered source instructions per man-hour. However, if 'productivity' is measured in equivalent user satisfaction per man-hour, prototyping did tend to be superior.
32 Introducing Systems Design • Flexible. Finally a dialogue should be able to cater for or tolerate different levels of user knowledge and perfonnance. There is usually more than one way to perfonn a task and hence dialogues must be designed to accept variations in the way a user converses with it. Many systems provide command or coded fastpaths allowing experienced users to go directly to the required function of the system. The Wmdows interface allows users the option of using 'alt' and the underscored letter (for example, 'alt-V' is 'View' in Microsoft Word) as an alternative to pointing and clicking with the mouse.
2. 7 Input design guidelines The selection of an appropriate input technology will be guided by: • the type of data being entered; • the frequency of data entry; • environmental conditions. 1 Output design factors and features. t. ld Allui. i I PLC Son~ry SoppLitr Trulter l Tr.... Trult .. l TrOll. Supplin --------_.. 00 ... _---_.. 1470"'2 ----- lUId,t rf~ IV'f",rt4 ~ HIlA t: ;6~
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