The decision process that you go through when deciding to make changes to your site can be tough. Even if those changes are likely necessary and needed, determining the best way to implement them can make you pause, and spend a lot of time considering all the potential alternatives that you might have. You can do a cost/benefit analysis, where you consider how much change you might make to your site, what the benefits of making that change might be, and what the costs might be in both making the change and deciding not to do so.
It shouldn’t require much thought to do things like make your website more usable, but it can, especially if the changes you make change around the look and feel of your pages, and the way that people interact with them. A good example are the changes taking place at Google, where the search engine has implemented a number of new design elements over the past year or so, including new colors and formatting of their search results pages, a different look to how local search results are presented within Web search results, URLs now appearing under page titles and above snippets for pages, and Instant Previews, which show a thumbnail of a page and call out boxes of text showing where query terms appear within those thumbnails.
On the subject of those Instant Previews, one of the challenges that search engines face is presenting web pages returned from a search in a way that helps searchers locate the information they want to find. A typical search result for a web page includes a page title, a URL for the page, and a short snippet that might be taken from a meta description or from text found on the page itself. A searcher is shown a page filled with these document representions to choose from, but sometimes that’s not enough to make a decision as to what page to click through.