…ave a clear path forward. Take it to the extreme and remove the entire checkout and you get Amazon. 1-Click checkout removes all the distractions of the checkout by using smart defaults. Customers setup their defaults once and never have to look at them again.
Progressive disclosure is an interaction design technique often used in human computer interaction to help maintain the focus of a user’s attention by reducing clutter, confusion, and cognitive workload. This improves usability by presenting only the minimum data required for the task at hand. (Wikipedia)