Tufts Health Plan (no relation to the school) made an poor design choice for guiding people through multistep processes on their website. The convention for wizards has been left to right just about forever; the button for continue should be on the right, and back/cancel should be on the left. Combine that with the same mapping for back and forward in web browsers and I’m pretty sure the mental model most users have of this activity is left to right. So much for stimulus-response compatibility here: