The International Society of Arachnology (ISA) promotes the study of arachnids and the exchange of information among researchers in this field. It acts as an umbrella organisation for regional societies and individuals interested in spiders, and related animals, and organises an International Congress every three years. History Conception The idea of arachnologists coming together for scientific meetings stems from the German zoologist Hermann Wiehle in 1959 . He encouraged Wolfgang Crome (Berlin) and Ernst Kullmann (Bonn) in this matter and a subsequent meeting of the German Zoological Society in Bonn in 1960 was used as a platform for the first arachnological meeting; with about 20 (mostly German) scientists in attendance. A second meeting, again associated with the German Zoological Society, followed in Saarbrücken in 1961 organised by Otto Kraus, and attracted additional international participation. The third meeting, again organised by Otto Kraus, was held in Frankfurt am Main in 1965 under the title III. Kongreß europäischer Arachnologen. C.I.D.A. During preparations for the Frankfurt meeting Otto Kraus and the French zoologist Max Vachon discussed the establishment of a formal organisation to improve international cooperation among arachnologists. In 1963 of the Centre International de Documentation Arachnologique (C.I.D.A.) based at the Muséum national d'histoire naturelle in Paris was formed. Max Vachon was the first Président and Otto Kraus the Président-adjoint; with Kraus becoming Président in 1965 and Vachon Secrétaire général. A series of national correspondents were also appointed as local representatives of the emerging society. From 1963, C.I.D.A. began to produce, every three years, an Annuaire des Arachnologistes Mondiaux – a list of active workers in the field of arachnology, cross-referenced by country and research interests – and a Liste des Travaux Arachnologiques – an annual list of recent scientific publications in this field. Following Frankfurt, further international meetings were held on a regular three year cycle beginning with the IVème Congrès International d’Arachnologie in 1968 in Paris, and thereafter known as the International Congress of Arachnology. ISA Administration of C.I.D.A. remained for many years in Paris, largely under Jacqueline Heurtault who was elected Secrétaire général adjoint in 1968 and Secrétaire général in 1983. Following her retirement from the post in 1998, administration of the society moved to Washington, D.C. with Jonathan Coddington at the United States National Museum taking over as Secretary. At the same time a proposal was made at the 1999 Chicago meeting to change the name to International Society