Don’t Design Misleading Signup and Login Forms
One particular aspect I often found in signup and login forms, which I consider to be wrong design, is that if the site are using e-mail addresses instead of a username to signup / login a visitor the password field comes right after the e-mail field. Here’s a screen shot:

This is logically correct, but for not so experienced users might be misleading. They think they should enter their e-mail address and e-mail password when signing up / in.
When we’re designing our forms we should explicitly mention that the particular password doesn’t necessarily must be the user’s e-mail password.
Personally I think the best method is using a username instead of e-mail address for authentication.
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