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Using “Sign in” vs using “Log in”

I'm porting an old application that has a "Log on" screen. When would I use "Log on" vs the alternatives (Sign In / Log In)?

marked as duplicate by JohnGB, Ben Brocka, Charles Boyung, Patrick McElhaney Nov 16 '11 at 1:24

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.


There is some evidence that Sign In and Sign Out are generally more readily understood than the alternatives, so if you have the opportunity you should change it.

There is some relevant discussion and links to research on this similar question: Using "Sign in" vs using "Log in"

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