the structure of a ship must assume the configuration which is demanded by the physical requirements of hydrodynamics together with the man-made rules of measurements and dimensional limitations conforming to its purpose. In addition,and of such importance thet it is the only phase of desing not subject to compromise, the ship's structure must have sufficiect built-in strength to with strength its anticipated loads. this inference of no compromise and anticipated loads is a desing problem thet admittedly must be treated with maximum rigor and serioosness, but at the same time is of an indeterminate nature.