...
The sign-in/sign-up page was was supposed to convey a concise “Introduction” to our site. We chose to have both the sign-in and the sign-up on the same page because, in our research, the act of having to go to a new page to either sign-in or sign-up was not favored by user testers. The decision we ultimately went with - both on the same page - was favored by user testers.
(Home page to signin/signup)
...