Web Usability

In my point of view, the term "Web usability" is make the web sites easy to use, clean and organised. The first thing the developer need to identify is "Does your site provides an efficient and enjoyable user experience?"
There are some guidelines for making homepages usability.

1. Make the site's purpose clear: Explain who you are and what you do. It includes start the page with a One-Sentence Tagline with the summarizes what the site or company dose and begin the title tag with the company name. For example: this website http://www.businessworld.ie/. The screen cut in the right site is showed that it began with Ireland's Top business Site, it is easy to let user identify what purpose of this website
2. Help user find what they need: it need to include a search input box in your web site and your homepage should offer users the site's top high-priority tasks. There is an example http://www.cpireland.crowneplaza.com/. The homepage looks nice and friendly. It includes brief description of this hotel, the booking function, hotel navigation button and a calender for checking wedding days. The user is very easy to get the tasks they'll undertake when visiting this site.
3. Reveal Site Content: Show some of the best and most recent content of the web site, begin link names with the important keyword and offer easy access to recent homepage features. For instance: http://www.starbucks.com/ this website put the recent news and blogger posts in its home page. For me it is very attractive to know what's new on this web site.
4. Use visual design to enhance the interaction. Images are powerful communicators when show items of interest to users, but will backfire if they seem frivolous or irrelevant. 

At last, one more necessary thing for making web page usability is usability test.  It evaluate the website by testing it on users. Nielsen (1994) stated that usability test can be seen as an irreplaceable usability practice, since it gives direct input on how real users use the system.