Jakob Nielsen's Top Ten Mistakes in Web Design
1. Using FramesSplitting a page into frames is very confusing for users since frames break the fundamental user model of the web page. All of a sudden, you cannot bookmark the current page and return to it (the bookmark points to another version of the frameset), URLs stop working, and printouts become difficult. Even worse, the predictability of user actions goes out the door: who knows what information will appear where when you click on a link?
2. Gratuitous Use of Bleeding-Edge TechnologyDon't try to attract users to your site by bragging about use of the latest web technology. You may attract a few nerds, but mainstream users will care more about useful content and your ability to offer good customer service. Using the latest and greatest before it is even out of beta is a sure way to discourage users: if their system crashes while visiting your site, you can bet that many of them will not be back. Unless you are in the business of selling Internet products or services, it is better to wait until some experience has been gained with respect to the appropriate ways of using new techniques. When desktop publishing was young, people put twenty fonts in their documents: let's avoid similar design bloat on the Web.
3. Scrolling Text, Marquees, and Constantly Running AnimationsNever include page elements that move incessantly. Moving images have an overpowering effect on the human peripheral vision. A web page should not emulate Times Square in New York City in its constant attack on the human senses: give your user some peace and quiet to actually read the text!
Of course, <BLINK> is simply evil. Enough said.
4. Complex URLsEven though machine-level addressing like the URL should never have been exposed in the user interface, it is there. Users sometimes need to type in a URL, so try to minimize the risk of typos by using short names with all lower-case characters and no special characters (many people don't know how to type a ~).
5. Orphan PagesMake sure that all pages include a clear indication of what web site they belong to since users may access pages directly without coming in through your home page. For the same reason, every page should have a link up to your home page as well as some indication of where they fit within the structure of your information space.
6. Long Scrolling PagesAll critical content and navigation options should be on the top part of the page.
Users will only scroll if they believe that there is something useful lower down the page.
7. Lack of Navigation SupportDon't assume that users know as much about your site as you do. They always have difficulty finding information, so they need support in the form of a strong sense of structure and place. Start your design with a good understanding of the structure of the information space and communicate this structure explicitly to the user. Provide a site map and let users know where they are and where they can go. Also, you will need a good search feature since even the best navigation support will never be enough.
8. Non-Standard Link ColorsBy default links to pages that have not been seen by the user are blue; links to previously seen pages are purple or red. Don't mess with these colors since the ability to understand what links have been followed is one of the few navigational aides that is standard in most web browsers. Consistency is key to teaching users what the link colors mean.
9. Outdated InformationBudget to hire a web gardener as part of your team. You need somebody to root out the weeds and replant the flowers as the website changes but most people would rather spend their time creating new content than on maintenance. In practice, maintenance is a cheap way of enhancing the content on your website since many old pages keep their relevance and should be linked into the new pages. Of course, some pages are better off being removed completely from the server after their expiration date.
10. Overly Long Download TimesI am placing this issue last because most people already know about it; not because it is the least important. Traditional human factors guidelines indicate 10 seconds as the maximum response time before users lose interest. On the web, users have been trained to endure so much suffering that it may be acceptable to increase this limit to 15 seconds for a few pages.
Even websites with high-end users need to consider download times: we have found that many of our customers access Sun's website from home computers in the evening because they are too busy to surf the web during working hours. Bandwidth is getting worse, not better, as the Internet adds users faster than the infrastructure can keep up.
Adapted from Jakob Nielsen's Alertbox for May 1996©UsabilityNet 2006. Reproduction permitted provided the source is acknowledged.