We've developed the first version of our website and going to lunch it and introduce it to a crowd. How do we know which part of our work has weakness and how we should correct it?
Aside from getting visitor feedback, usability testing can help catch a great many issues. When it comes to website usage, many visitors/customers might be able to tell you that something isn't right, but they may not be able to pinpoint what that "something" is. Usability analysts know what to look for and know how to spot pitfalls.