Does the website take a long time to download? Is the information presented in a logical way? Is it easy to navigate around and go back? Is it easy to read? Are the graphics appropriate to the information presented? Do the graphics make it difficult to read or use the site?
Do you need to register? Registration may be acceptable if the information is not available on any other appropriate site. Are there any restrictions? For example copyright restrictions may not allow printing.
Are the links working? Broken links can be a sign of a website that is not updated regularly. Are the external links appropriate to the requirements of the audience of the main website.
Is there an internal search mechanism? This is not always necessary, but might be required if the site includes a large amount of information. Does the search mechanism provide different searching options? Are the search results an appropriate response to the search query?
Is the layout consistent throughout? Is it easy to find information? Is there consistency in the use of colour, fonts, graphics, design and language?
Look for navigation aids, such as back buttons, home, previous page and search path. A site map or contents list can be useful. These features can improve usability depending on the size of the site.