User experience design is about designing the ideal experience of using a service or product. User experience design is used in relation to websites, web applications and other software applications. Click here to view the process Case Study.
Effectiveness is about whether users can complete their goals with a high degree of accuracy. Much of the effectiveness of a product comes from the support provided to users while interacting with the product
Effectiveness and efficiency have come to be blurred in the mind. They are, however, quite different from a usability perspective. Efficiency is all about speed. How fast can the user get the job done?
Engagement refers to the level of engagement a system offers. Indeed, engagement has become something of a buzzword, but if you cut through the fluff, you’ll find that engagement occurs when the user finds the product pleasant and gratifying to use.
It seems unlikely that—for any degree of complexity—you can completely eliminate errors in products; in particular, digital products may be error-prone because of the ecosystem in which they dwell – an ecosystem which is beyond the designer’s control.