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27342_104 - Introduction The Interdisciplinary Design...

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1 Universal Usability Introduction The Interdisciplinary Design Science of Human-Computer Interaction (HCI) combines knowledge and methods associated with professionals including: Psychologists (incl. Experimental, Educational, and Industrial Psychologists) Computer Scientists Instructional and Graphic Designers Technical Writers Human Factors and Ergonomics Experts Anthropologists and Sociologists Fig 1.1A System interfaces Courses? Manual? System Hotline? User interfaces Accounting system Technical interfaces Factory Fig 1.1B Quality factors All factors important. Hard to measure, but possible. Easy to make a user interface: Just give access to the database Hard to make a good user interface Quality factors: Correctness Availability Performance Security Ease of use Maintainability . . . Functionality: Necessary features see, edit create, delete Database Usability requirements Synonyms for “user-friendly” in Microsoft Word 2002 are easy to use; accessible; comprehensible; intelligible; idiot proof; available; and ready But a “friend” also seeks to help and be valuable. A friend is not only understandable, but understands. A friend is reliable and doesn’t hurt. A friend is pleasant to be with. These measures are still subjective and vague, so a systematic process is necessary to develop usable systems for specific users in a specific context Usability requirements (cont.) The U.S. Military Standard for Human Engineering Design Criteria (1999) states these purposes: Achieve required performance by operator, control, and maintenance personnel Minimize skill and personnel requirements and training time Achieve required reliability of personnel-equipment/software combinations Foster design standardization within and among systems Should improving the user’s quality of life and the community also be objectives? Usability requires project management and careful attention to requirements analysis and testing for clearly defined objectives
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2 Goals for requirements analysis Ascertain the user’s needs Determine what tasks and subtasks must be carried out Common tasks are easy to identify. Include tasks performed only occasionally. exceptional task for emergency condition. Functionality must match need or else users will reject or underutilize the product Goals for requirements analysis Ensure reliability Actions must function as specified Database data displayed must reflect the actual database Appease the user's sense of mistrust The system should be available as often as possible The system must not introduce errors Ensure the user's privacy and data security by protecting against unwarranted access, destruction of data, and malicious tampering Goals for requirements analysis Promote standardization, integration, consistency, and portability Standardization : use pre-existing industry standards where they exist to aid learning and avoid errors (e.g.
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