User Centered-Design (UCD) is a philosophy and a process. It is a philosophy that places the person (as opposed to the ‘thing’) at the center; it is a process that focuses on cognitive factors (such as perception, memory, learning, problem-solving, etc.) as they come into play during peoples’ interactions with things.
Imagine that you’ve been bindfolded and locked insite a trunk of a car, then driven around for a while and dumped on a strange street. Could you look around the place and tell exactly where you are? If you ask your site users something like that while giving them a random link on your site, how would the answer be? Do you expect them to tell exactly where they are and what your site is about? If yes, firstly check if your have a user-friendly site by this simple but useful test.
From UPA in the ISO 9241 standard:
Usability is an approach to product development that incorporates direct user feedback throughout the development cycle in order to reduce costs and create products and tools that meet user needs. There are many definitions of usability from books by usability professionals.
