Usability

Usability can be measured as a combination of these factors:

• Ease of learning – It is a measure of how fast a reader can start learning and navigating through a hypertext document. Good presentation structure and graphic design are key determinants.
• Ease of use – It is a measure of how fast a reader can locate information. Appropriately defined links, search mechanisms, backtracks, landmarks and other navigational aids can greatly increase efficiency of use.
• Error handling – It is a measure of how many errors a reader makes and how easy it is for them to recover from such errors.