Complementary to the TSB, DEWS addressed the downstream flow of information from a TWS to different types of message recipients. For this purpose procedures and components for the dissemination of customized warning messages and tsunami bulletins in a multilingual environment, suited for a broad range of individual message recipients, have been developed. Additionally, the information flow between national TWS in the Indian Ocean Basin (i.e. Indonesia, Thailand, and Sri Lanka) has been analysed and a basic concept for a wide area warning centre communication has been developed.