The European Commission, under Directorate-General for Environment (DG ENV) as file leader of the Community Strategy on Endocrine Disrupters, In 2010, DG ENV created an ad hoc group of Commission Services and Member States on the EU Community Strategy on Endocrine Disrupters. The ad hoc group created the Endocrine Disrupters Expert Advisory Group (ED EAG) in November 2011 to provide scientific advice on the development of criteria for identification of EDs. The European Commission's Joint Research Centre was tasked with running the expert sub-group, consisting of around 40 experts nominated by Member State regulatory authorities, relevant industry associations and non-governmental consumer/environmental protection organisations. This report captures the experts' opinions on key scientific issues relevant to the identification and characterisation of endocrine disrupting substances (EDs). It provides one input to the Commission’s decisions on the establishment of horizontal criteria for the identification of EDs to be applied as appropriate across all relevant pieces of legislation concerning the control and risk management of chemicals substances (including pesticides, biocides, pharmaceuticals, industrial chemicals, controls on water quality, occupational exposure, etc).