During user tests we see quite some people 1) enter their previous chosen login details (email+pass) on the registration page. Including them wondering "why we ask all this information again?". The process fails right now as there already is such an email address.
Also, 2) some people fill in their email+pass for the first time on the login page. Without ever being registered before this also fails.
Of course we can adjust the notification at failure;
already registered? go login, and
not registered yet?. But that feels not the best, and, is too late.
We also tried having such notifications before you fill in the form. So
log in here. haven't registered yet? ... But it feels a bit bad still, and it still doesn't catch all users
Are there any good practices? Or do you have another idea, on how to solve this issue? Is it in the wording and visual appearance of these notifications? (I don't really believe so..) - Or is there something more deeply wrong / to solve? (I hope so :))
PS: I've seen the question about merging the registration and login page into one, but I'm not convinced that is the way I want to go.