The new interface divides the menu (on the left) into the course's 15 weeks--4 parts with 2 to 5 weeks per part--to allow for easier navigation of the site. The week selected is identified by the colored button and lettering. Topics within any week are listed at the top of the screen (just under this frame in the tour), along with any internal links within a page. Then the instructional material appears in the bottom right frame.