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Imran Hussain University of Management and Technology (UMT)

Virtual University Human-Computer Interaction. Lecture 43 Information Retrieval. Imran Hussain University of Management and Technology (UMT). In the Last Lecture. Various ways in which computer communicate with users Error messages Notifier and conformation dialog boxes.

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Imran Hussain University of Management and Technology (UMT)

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  1. Virtual UniversityHuman-Computer Interaction Lecture 43Information Retrieval Imran Hussain University of Management and Technology (UMT)

  2. In the Last Lecture Various ways in which computer communicate with users • Error messages • Notifier and conformation dialog boxes

  3. In the Today Lecture Various methods of provided audio feedback • Negative • Positive Ways in which software application communicates and conveys information to the user Information retrieval in desktop environment Discipline of information architecture within the web environment

  4. Negative audible feedback: Announcing user failure • Negative audible feedback • noise is emitted when something bad happens

  5. Positive audible feedback • Examples • Closing a door • Pressing light switch • Turning key in car ignition

  6. Available Choices No noise vs. noise for negative feedback No noise vs. unpleasant noise for negative feedback No noise vs. soft and pleasant noises for positive feedback

  7. One of the objective with software application is to communicate brand and identity of the software application

  8. Your identity on the desktop • ways of asserting identity • Program’s icon • Program’s name

  9. Your program’s icon • Should readily visible • 2 different sizes icons in windows • 32 x 32 pixels (desktop) • 16 x 16 pixels (title bar) • Icon should be • High quality • Visibly distinct at distance from other icons

  10. Your program’s name • Appears in 2 places • Title bar (of program’s main window) • Taskbar

  11. Ancillary application windows • These are windows that are not really part of the application’s functionality • Available on request • E.g., credit screens

  12. About boxes • A simple dialog box that identifies the program to user

  13. About boxes 1 2 3 4 5

  14. Splash screens • Screens that appear in first instance • Used for branding and marketing

  15. Shareware splash screens 1

  16. Online help • Online help should be provided but should not be substitute for good design

  17. The index • Users don’t read manuals like book, so index is useful • Indexes should be created carefully and it is recommended that it should be done by professional indexer • List of index entries is more important that text itself • provide synonyms • Example • User want to black the cell in the table in word processor • “how can I set shading of this cell to 100%”

  18. Storage and Retrieval Systems • Storage system • A method for safekeeping goods in a repository • A physical system composed of a container and the tools necessary to put objects in and take them back out again • Retrieval system • A method for finding goods in a repository • A logical system that allows goods to be located according to some abstract value (e.g., like name, position, etc.)

  19. Storage and Retrieval in the Physical World • Storage and retrieval by location • Indexed retrieval

  20. Storage and retrieval by location • In physical world, remembering where we put an item – its address, or location – helps us to find it • Book • We go to where we left book, or where others books are found • We don’t find books by association.

  21. Indexed retrieval • For large volumes, storage and retrieval by location is not possible • Libraries … Dewey Decimal system • Give every book an index number based on its title and subject matter • The books are shelved in this numerical order • If you know number, you can find book

  22. Indexed retrieval How to find number? Use index • A collection of records that allows you to find location of an item by looking up an attribute of the item • 3 copies of cards created for each book • Each card placed in a separate index • You physically retrieve book by participating in a system of storage (shelves and numbers), but logically find the book by participating in a system of retrieval (card indices)

  23. Retrieval methods • 3 ways to find a document on a computer • Positional retrieval (remember location) • Identity retrieval (remember name) • Associative or attributed-based retrieval

  24. An attribute-based retrieval system • Today’s desktops cannot adopt an attribute-based retrieval system • Attribute-based system could allow user find documents by • Synonyms • Related topics • Attributes

  25. Information architecture system for web site • Organizational systems • Labeling systems • Navigational systems • Searching systems

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