(a) Technological limitations are unlikely to restrict marine developments. (b) Shipowner's technical staffs will promote progress and will watch closely proposed legislation affecting design and operation. (c) The dialogue with legislating authorities must be on a proper technological basis with the financial consequences fully appreciated. (d) Much existing legislation could well be revised, e.g. load lines. (e) Future research might include: The sea wave spectra and ship motions. The ship materials, corrosion and navigation. Environment dredging, undersea studies, port development. Economic insurance, cost benefits of new transport systems. (f) Against the increasing cost of new transport systems, policy decisions will require careful evaluation, and the relationships with legislatory bodies will need attention to avoid unfair restrictions.