The heart of the Harvard-Radcliffe Science Fiction Association are the Special Interest Groups, called SIGs for short. Any HRSFA member can attempt to create a SIG on just about any area of interest. SIGs with more than eight members can be approved as real SIGs by the general membership; many others continue to exist as unofficial SIGs. The rest of this page contains alphabetical lists of HRSFA SIGs, divided into those active and those that have no longer exist through lack of interest. See the main page for the weekly SIG schedule.