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I was trying a similar approach to google which login in 1 page and password in the second but a coworker said that for accessibility reasons password and login should be in one screen. Is there any science-based evidence for this?

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    Have you looked at why Google does that in the first place? It seems like the benefits summarized in the top answer might fit their use case, but not most services. – maxathousand May 25 '18 at 20:53
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    there are no accessibility issues with having the id/pw on the same page or separate pages provided they're labeled properly. – slugolicious May 25 '18 at 21:24
  • @slugolicious and also that the flow can be navigated with keyboard – qoba May 26 '18 at 6:34
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This seems to be a heated debate but here is Google's official explanation regarding why they separated username/password onto different pages for Gmail:

This new Google account sign-in flow will provide the following advantages:

  • Preparation for future authentication solutions that complement passwords
  • Reduced confusion among people who have multiple Google accounts
  • A better experience for SAML SSO users, such as university students or corporate users that sign in with a different identity provider than Google

I could see separating UN/PW across different pages having security advantages, e.g., the system could theoretically offer more personalized security authentication (based on the email entered, offer an image or phrase specific to that email/user), then ask for password. But, no doubt, this security technique wouldn't be foolproof.

See this Ghacks article for more on this subject.

From a UX/usability standpoint, having the UN/PW on one page would likely be faster for the user, of course. Usability vs. security; there are always trade-offs to make. ;)

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