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Example, a user name might be "ekg7d9a", but the user's real name is "Charlie Hanes", and the email is "".

What are the dominant reasons to use non-related user names with logins and email addresses vs an at-least-equally-common method of having "Charlie Hanes" using "chanes" as his login?

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An approach which can indeed be useful is using the company employee ID as his/her login (in companies where employees are assigned an ID, of course); this allows for easier mapping between AD and other HR applications.

Also, this removes the headache of handling duplicate names, which can become a real issue when lots of people are involved in the company.

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The problem we run in to a lot here is people insisting on changing their usernames due to marriage/divorce, etc. Usernames not tied to a demographic piece of information completely sidesteps the entire issue.

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Because employees are in fact "human resources" and can be identified and tracked by using non-personally identifiable identifiers just as you would with any other business resource.

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personally, I hate the use of "resource" when it comes to a person - it's too sterile for my taste :) – warren Nov 30 '12 at 17:27
@warren I guess "human liability" is too honest for widespread corporate adoption. – HopelessN00b Dec 1 '12 at 19:03

Security's an oft-cited reason (though one of dubious value, in my opinion). Particularly for high access individuals, there is some merit to not linking their user ID to a publicly available piece of information, like their name - it's another piece of information an attacker would have to acquire before getting access to a given individual's account.

In theory it makes some sense, but in my experience, no one's network and devices are locked down hard enough to make it actually difficult to acquire a person's username, with even very minimal "access"/visibility.

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