Should I turn in partial work or wait until I am done?
Most of the weekly course modules ask you do a number of concrete activities that help you build toward your final portfolio. These may include making a single webpage or posting some feedback to fellow students. We try to be very explicit with what will be getting graded in each module.
In summary, we believe it is better to get something for a assignment posted on time (like a draft of a resumé) and to improve upon it as we go than to wait for everything to be perfect. There will be time to revise and improve later.