Every time someone flies a plane into restricted air space over the Library of Congress, we get to evacuate our offices and stand around outside for a while. So we’re spending quite a few whiles standing around outside these days. Of course, our Dewey antennae don’t wilt in direct sunlight (far from it), and on these particular occasions they can’t help but turn toward the numbers for terrorism. Aspects of terrorism are treated in so many different disciplines that it can often be difficult for classifiers to determine where to class works on the subject. A work on a specific incident or series of incidents should be classed in the 900s with the history of the location of the incident(s); a general work on the sociology of terrorism (e.g., on its causes and effects) should go in sociology, at 303.625 Terrorism; while a work that considers terrorism as a social problem in connection with actual and potential remedies should be classed in social problems and services, at 363.32 Control of violence and terrorism. Does this mean that general works on the current “war on terrorism” as a whole should be classed somewhere in 900 History & geography? Or should this “war” be treated not as a historical event but (like the “war on drugs”) as a general effort to remedy a pervasive social problem, and classed at 363.32? We are currently working on an expansion of 363.32 to allow for more specific classing of different types and aspects of terrorism. EPC will review the draft expansion this October. Meanwhile, we’d be very interested to hear your views on the treatment of terrorism in the DDC -- hit that “Comments” button now!