http://www.amazon.com/Missing-Peace-...2070345&sr=8-1
That's if you'd really like to get familiar with the subject.
Bottom line - the PLO violated nearly EVERY item it agreed to in the Declaration of Principles. In fact, while STILL in Oslo Arafat notoriously was telling Arab media (in a closed Arabic meeting) that he didn't take them seriously and that they were a means to an end.