Measure Failure
It’s often obvious when your product has failed its users, so this is one area where it can be simple to get useful data on areas that require improvements.
If your users encounter a 404 page or a similar error when using your website, you know that something went wrong. Keep track of such errors and of the referring sites, and fix the issues if possible.
If your users search for something and get zero search results or don’t click any of the search results they receive, it might make sense to look at the search string they entered and try to figure out why they didn’t find what they were looking for. Is there anything you can do to fix this issue?
Whenever people undo something, it might be because your product didn’t do what ...
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