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--- Web Usability ---

A Definition

bulletThe measure of how effective a web page is.
bulletTwo perspectives: the developer (owner) and the viewer.
bulletDeveloper/owner: does the site solve the corporate need (whatever that is).
bulletViewer: does the site solve their problem.
bulletOf the two criteria, the viewer is most important.

Measuring Usability

The measurement of web usability tends to be subjective, but can be broken down so that a quantitative judgment can be made.  The criteria includes:

bulletDownload (page size)...
bulletIf the site is broadly accessed (e.g., by general public) then assume typical access of 28kbps.
bulletRemember page size includes HTML and graphics.
bulletTake advantage of image caching.
bulletConsider layering page sizes (e.g., home page: 20-30 KB, second layer: up to 40 KB, third layer and further 50KB).
bulletBrowser compatibility...
bulletTry to be compatible.
bulletAvoid browser specific formatting and technologies.
bulletBe clear what you are compatible with if necessary.
bulletDoes the site identify/support the owner?
bulletIncludes a logo or name to identify the site.
bulletIncludes a brief, succinct definition of the owner.
bulletIdentify how the site is valuable and special (i.e., unique).
bulletIdentify the owner (about, resume, news information, contact us).
bulletIs the site "scannable" - i.e., can you get the basic message in a quick read (good) or must you read everything (not so good)?
bulletAvoid redundancy (e.g., repeating text, links).
bulletUse consistent formatting (fonts, sizes, styles).
bulletLabeling is useful but should add something (e.g., set a tone).
bulletUse bullets (with more than one item).
bulletSubstitute text paragraphs with bullets.
bulletStart with conclusions, then support it.
bulletAvoid corporate lingo, acronyms, abbreviations, etc..
bulletAvoid all caps, extra spaces (between letters, words).
bulletDoes the site use examples effectively?
bulletUse words and pictures to improve understanding.
bulletUse examples to make things clear.
bulletUse links and examples together
bulletDoes the site preserve the past?  Preserve important content for reference (by filenames, easy-to-use links, etc.).
bulletLinks...
bulletShould be differentiable (colors, wording, etc.).
bulletDo not use "click here".
bulletShow visited, unvisited links.
bulletIdentify links to different content.
bulletNavigation...
bulletMake primary navigation stand out.
bulletAvoid navigation at the bottom of the page unless it is redundant.
bulletAvoid routing pages (just links) -- try to include useful content.
bulletGroup similar links together.
bulletDo not duplicate links by coming from different places.
bulletAlways have a link the home page.
bulletAvoid icons (use text in buttons).
bulletDo not use made-up words or owner-specific lingo.
bulletSearch...
bulletHave search on the home page.
bulletUse a "Search" button.
bulletSearch the entire site.
bulletAvoid "Search the Web" options.
bulletBrowser Tools...
bulletDo not reproduce browser functions (Back, Reload).
bulletFocus on major tasks (e.g., present information, fill out a form, etc.).
bulletPictures...
bulletUse appropriate format for graphics.
bulletUse ALT tags to explain pictures.
bulletUse pictures as content, not decoration.
bulletLabel pictures if meaning is not clear.
bulletCrop pictures appropriately to the page layout.
bulletUse animation for a reason, not to entertain. 
bulletDo not animate logos and page elements to make them stand out.
bulletPage design...
bulletAvoid broad color spectrum.
bulletUse color to segment and highlight.
bulletLimit fonts and styles.
bulletUse high contrast between background and foreground text.
bulletKeep important stuff "above the fold".
bulletUse "liquid layout" to take advantage of the page space.
bulletAvoid horizontal scrolling to 800X600.
bulletWidgets...
bulletIf widgets are used to support links, they should be hot.
bulletAvoid overly long menu drop-downs/popups and make them self-explanatory.
bulletURLs
bulletMake sure your site responds to both acme.com and www.acme.com.
bulletConsider using alternative spellings for the domain...e.g., acme.com, akme.com, acmee.com.
bulletWindows and Popup Windows...
bulletDo not use popup windows on the homepage.
bulletif using popup windows, make the close button obvious and prominent (top-left).
bulletDo not use splash screens.
bulletCredits and bragging...
bulletKeep award bragging to a minimum and not on the the home page.
bulletIf bragging about awards, make them recent.
bulletAvoid credits in general, especially on the home page, or bury them at the bottom.
bulletForms...
bulletVertically position input boxes and provide adequate room for input (i.e., character count).
bulletMake labels descriptive (e.g., "Enter Zip Code (5 digit):").
bulletValidate user input locally and make error messages clear; take the user back (focus) to the problem identified.
bullet 
bulletInteractives (plug-ins, ActiveX, etc.)...
bulletClearly explain the use of the item (why it is there, how to use it).
bulletClearly explain need to download supporting elements (e.g., plug-ins).
bulletAutomate as much as possible for downloading support components.
bulletMultimedia (digital audio and video)...
bulletAvoid use when bandwidth is limited.
bulletAvoid background music (e.g., MIDI files) unless they add something.
bulletBe careful with formats, explain special requirements (e.g., browser level, drivers, etc.).

Do all of these rules have to be followed?

Yes and no.  If you do not include them, then be able to justify it.  In some cases, there are perfectly valid exceptions.

Screen Real Estate

Consider the following for using the screen (actually the browser window)...

bulletUse the entire window; avoid blank open spaces.
bulletCreate consistency across the site, especially...
bulletLogo placement
bulletNavigation
bulletColors
bulletFont style, color, labels.
bulletUse tables to manage content.
bulletOrder of importance:
bulletContent
bulletNavigation
bulletSite/page identity
bulletSelf-promotion
bulletAdvertising
bulletNever assume the browser size; consider minimum of 400X300 pixels and maximum of 1024X768 pixels; design for liquid layout.

Note: some of this material has been adapted from Homepage Usability and Designing Web Usability (Nielsen/Mahir, and Nielsen).

 

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