Website usability should be an essential part of your online strategy, but it is so easily overlooked or overshadowed by pretty design. Here is a quick list of 7 things that can cause your users to get frustrated and go elsewhere.
Search is a very important part of any site, and if it doesn't work then your users will just get frustrated and go to another company. Website search usability comes in two parts, the search box itself and the results.
When creating a search box you need to have a single text box and a button labelled "Search". That is about as complicated as you need to go, although it is okay to have a drop down box of categories, as long as the default is "All Categories". When the user has done a search, the search box should contain what they searched for, so that they can refine their query if the need to.