I did not properly insert this link into the above article on taqiyya (which I have corrected). If you missed the correction, here is the link
http://www.raymondibrahim.com/islam/...-rules-of-war/ It is fundamental to understanding any negotiations with Shia or Sunni Muslims who correctly practice their faith.
It's a long but interesting article, and well worth reading, in terms of understanding an important tenet of Islam.