1 / 19

Hypermedia and the Web

Hypermedia and the Web. Bush’s Hypertext Vision. Vannevar Bush, 1945 “As We May Think” Vision of post-war activities, Memex “…when one of these items is in view, the other can be instantly recalled merely by tapping a button”. Nelson’s Hypertext.

enrico
Download Presentation

Hypermedia and the Web

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hypermedia and the Web

  2. Bush’s Hypertext Vision • Vannevar Bush, 1945 “As We May Think” • Vision of post-war activities, Memex • “…when one of these items is in view, the other can be instantly recalled merely by tapping a button”

  3. Nelson’s Hypertext • Coined “hypertext” in discussing his universal library and docuverse • Had vision of a Xanadu system with hypergrams (branching pictures), hypermaps (with transparent overlays), and branching movies • Many concepts adopted in WWW

  4. Early Commercial Systems • Knowledge Systems’ KMS • One or two frames of text/graphics • Links (tree/annotation) to additional information • Xerox PARC’s NoteCards • Cue card metaphor • Resizable but non-scrollable • Apple’s HyperCard • Deck of cards metaphor • Links to other cards/programs

  5. Hyperties • Uses electronic encyclopedia metaphor • Indices and table of contents list contents of information space • History lists show recently visited pages • No syntactic entry means no error messages (and less flexibility?) • Used in help systems, books

  6. Shneiderman’s Golden Rulesof Hypertext Choose projects where: • There is a large body of information in numerous fragments • The fragments relate to each other • The user needs only a small fraction of the fragments at a time

  7. Know the users and their tasks Ensure that meaningful structure comes first Apply diverse skills Repect information chunking Show interrelationships Ensure simplicity in traversal Design each screen carefully such that they can be grasped easily Require low cognitive load Hypertext Guidelines

  8. Hypermedia and theWorld Wide Web

  9. Jacob Nielsen • Designed Sun Microsystem’s Web site in early 1990s • Chronicled nine versions of the site • Employed usability testing approach • Author of numerous books and articles on Web design • Writes bi-weekly article at www.useit.com

  10. How To Write On The Web(March 15, 1997) • Relates to how users read on the Web (they don’t) • Be succinct: write, cut in half, cut in half again • Write for skimmers: use multiple levels of headlines, be meaningful, highlight • Use inverted pyramids (start w/conclusion, add support, end w/background)

  11. Web vs GUI Design(May 1, 1997) • Give up full control (users, hardware, software have control) • Plan for device diversity (in GUIs every pixel is controlled, on Web sw/devices differ) • User controls Web navigation • Web is part of a whole with other options

  12. Frames Gratuitous use of bleeding edge technology Scrolling text and constant animations Complex URLs Orphan pages Long scrolling pages Lack of navigation support Non-standard link colors Outdated information Overly long (>10 sec) download times Top Ten Mistakes(May 1996)

  13. Why Frames Suck(December 1996, revisited) • Broken back button • Printing problems • Authoring problems (hard to learn) • Search problems • User preferences • Nielsen acknowledges that frames are no longer a “disaster”, but are still “clumsy”

  14. Users are reluctant to update browsers Thick line shows actual data, thin shows projection Web pages most be designed to work with older browsers or risk losing users Browser Version PersistenceApril 18, 1999

  15. The Case for MicropaymentsJanuary 25, 1998 • Nielsen predicts that most non-sales sites will move to micropayments within 2 years • Time costs money, replace ad download with direct payment • Most pages will cost less than a penny (cost invisible), others 1-10 cents (shown with an icon), others more (must click OK) • Equates Web use with long distance calls and electricity

  16. Four trends require toned down appearance Users spend most of their time at other sites Mobile devices drive standardized navigation Use of multiple devices require semantic, not representation, emphasis Syndicated content What remains in Web design? Task-based development (what do users want) Content design (visit site for content, not looks) Information architecture beyond standard links End of Web DesignJuly 23, 2000

  17. Poynter Institute study: Text (78%) attracts attention before graphics Headlines should be simple and direct Shallow reading is common (users select short articles, only read 75% of it) Users alternate between two open browsers (design for easy reorientation) Implications for non-newspaper sites Must establish trust Users spend less time at non-news sites Users will read fewer words on non-news sites Eyetracking Study of Web UsersMay 14, 2000

  18. Wireless Application Protocol (WAP) defines a way to access the Internet with phones 70% of users said they would not be using WAP in a year Even simple tasks required too much time WAP guidelines Do not use traditional Web design principles Develop a distinct voice with minimal word count Do not use unique (and unclear) labels/menus Match information architecture with tasks (provide TV listings by time, not network) WAP Doesn’t WorkDecember 10, 2000

  19. Are Users Stupid?Feb 4, 2001 • Opponents of usability claim that it focuses on stupid users who cannot overcome complexity • Do not exclude potential buyers from your site for elitist reasons • Even if users can overcome complexity, that does not mean that they will

More Related