30 Years of development of the design criteria for flood protection and watercontrol works by prof.J.F.Agema The joint evaluation of design construction of large scale concrete coastal structures by J.C.Slagter 500,000 Cubic metres of prefabricated, prestressed concrete by A.A.H. van Dam Special equipment as a result of integrated design and construction by J.M.Schetters The Eastern Scheldt barrier in the family of ever growing use of prestressed concrete for offshore applications by Ben C.Gerwick Jr Probability design method by J.K.Vrijling Durability and corrosion by H. van Schaik Gates by E.Ypey Operating machinery for the gates in the barrier by J.F.Remery Methods and tools used in construction by G.Offringa Labour and social aspects of the barrier construction by J.Brants Assembly by Tj.Visser Transport and placing of 18,000 tons piers by R. de Leeuw Durability testing by T.Monnier Investigation of the mechanical properties of fresh and hardened concrete by Prof.H.W.Reinhardt, P. van den Berg, K.M.Postma and D.w. de Haan Dimensional deviations and tolerances in the assembling of the construction elements by F.F.M. de Graaf Surveying systems by R. Jellema