Many time when we design test cases we forget to design cases using the back button. Within a web application the back button on a browser can case unexpected and unwanted behavior. The reasons seems to be because the behavior is controlled through the users browser and nobody seems to expect different behavior. I have seen this problem where the page which the user is trying to return to needs a value which was retrieved in the last page but does not remain in session since the first page never had the value. This seems to cause applicaiton errors and is then difficult to track down if this is found to be happening post deployment. We cannot do exhaustive testing but implementing some of this testing into our test scripts can help alleviate pesky anoyances once in production. Especially if there is very little monitoring of error logs or tracking of support issues once the build is deployed to production. Check you back button!!