the society is headed by an executive committee which includes a president, vice-president, past-president, treasurer, secretary and webmaster; plus a number of ordinary council members. in addition to this, there are regional correspondents. ideally one is appointed for each country, and they act as local representatives and contact points for questions relating to spiders and other arachnids. a general assembly of the society is held every three years during the international congress. as of 2015, isa has about 560 members world-wide encompassing most of the world's professional and semi-professional arachnologists.