The International Association of Insurance Law/Association Internationale de Droit des Assurances (AIDA) was formed in 1960 for the purpose of promoting and developing, at an international level, collaboration between its members with a view to increasing the study and knowledge of international and national insurance law and related matters. It is in the spirit of furthering these collective goals that the Turkish and German Insurance Law Associations as national chapters of AIDA held a joint seminar on Transparency in Insurance Law on 4th May 2012 in Istanbul. The lectures that were held during this conference are collected in the publication "Transparency in Insurance Law, Instanbul, 4 Mai 2012 ". All authors share in the assessment that transparency has developed into a guiding principle of modern insurance law (contract law, insurance mediation law and supervisory law). There is an increased importance of transparency and of legal transparency requirements. The reasons are manifold and different for the single areas of insurance law. The decision for what areas by which means and to what extent transparency should be legally required is a political one. Such a decision should be taken by paying heed to its potential impact on the whole insurance system. The financial consequences of such a decision should be carefully considered as well since it is the policyholder who will finally have to bear the costs. It is insofar a crucial duty of the legislator to achieve a balance between an equitable amount of transparency and a cost efficient conduction of business in order to increase the welfare gain created by insurance.