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For a long time Panel H-7 of the Hydrodynamics Committee, SNAME, has been concerned with evaluating the seakeeping performance of ships. Both experimental and theoretical techniques for determining the motions of alternative ship designs in regular and irregular waves have advanced rapidly in recent years. But questions have remained as to what is good behavior and what is bad, what is acceptable and what is unacceptable performance. In short, how can standards of "seakeepability" be established? The Panel hopes that this survey will clarify a difficult and important problem and that others will use it as a basis for further development of techniques for evaluating ship environmental operability.