This site describes several ways that presidential and parliamentary systems are similar.
http://www.undp.org/governance/docs/Parl-Pub-govern.htm
Note that they are both democratic and have a separation of powers between the three branches of government.
How are presidential and parliamentary systems similiar?
3 answers
Thanks! That helped out a bunch! I didn't have any problems finding differences between the two. I was just stumped on how they were alike.
You're welcome.