Designing Intersection Flows
http://www.guuui.com/issues/02_05.php

Olsen, Henrik
GUUUI
2005

Abstract:

When forms give users the option to continue in two or more alternative directions, such as registering as a new customer or signing in as a returning one, unfortunate users will take the wrong turn if it isn't unmistakably obvious which way they should go. In this article, we'll take a look at a few intersection flows that have caused users problems.