From another angle, you may need to add features for a specific purpose. Recently it became mandatory to have a Privacy Policy displayed on your site in order to attract 'Big Business' advertisers. A legal disclaimer against liability becomes necessary as your business or nature of service evolves. Copyright notices may need to be added or modified over time. Employing New Technology Technology changes very rapidly on the Web.
Some developments are exciting and revolutionary.
Others fade away as suddenly as they arrived. Redesigning your site lets you experiment with new technology. If your site offers stock quotes, the Mobile Wireless Internet gives you a chance to reach customers with the latest developments - instantly, anywhere. If you offer video movie downloads, the growing number of DSL subscribers is good news for you - and merits a redesign. The reasons are varied, but essentially not every method of revenue generation is suitable for a given site.