Sleidia,
I totally agree that you cannot possibly cater for every way of thinking.
I have completed usablity tests in the past and the results would have shocked most people. Users were asked to indentify the following:
1) As soon as the page loads, what is the purpose of the site?
2) Where are the navigation options?
They were also asked to find specific items on the site and a few of them got lost. Now, you might say that this is bad design but I would say that it is not, one user when asked to navigate for contact details, totally missed a VERY prominent link with the words "Contact Us".
You can make content and navigation as easy to use as possible, but people will still get it wrong, this is a fact of life.
I leave you all with something to think about.
Have you ever entered a store looking for something and had to either ask someone or walk about searching for it? Most people, if not all will have at one point in their lives. You get pointed to the item and think "Why the heck didn't I notice that?" The person before or after you may have found the store easy to navigate and found the product straight away.
Because you did not find the item does not make the store design ineffective, it was the way that you approached the situation and what you expected. You can never cater for every single person, this is an impossible task to acheive.
BTW. TexanBetty, We also tested users on Amazon and although most users could find what they required, still others could not. This just backs up what I am saying.
Hope this helps Wullie