Editor's Note: We published this analysis about Inspire, a magazine by al Qaeda in the Arabian Peninsula that has in fact inspired several terrorist plots, on March 21, 2013. The magazine has increased in stature after the revelation that the alleged Boston Marathon bombers apparently relied on the publication when planning their attack. By Scott Stewart Vice President of Analysis Al Qaeda in the Arabian Peninsula released the 10th edition of its English-language magazine, Inspire, on March 1. After discussing its contents with our analytical team, initially I decided not to write about it. I concluded that Inspire 10 conformed closely to the previous nine editions and that our analysis of the magazine, from its inception to its re-emergence after the death of editor Samir Khan , was more than adequate.