Abstract: A method of analyzing crack growth in an object takes into account interaction between indications of discontinuities that can become cracks and also effects of creep on crack growth to provide a more accurate analysis of crack growth. The remaining life of an object is determined by calculating a critical crack size from worst case conditions and defining loading blocks representing cycles of temperature and stress changes. The rate of growth in the size of indications estimated from non-destructive evaluation is accumulated based upon the defined loading blocks until one of the indications reaches the critical crack size. The allowable stress which can be placed upon the object can be calculated from the same estimates of indication size and assuming different stress levels until a desired lifetime of the object is attained when one of the indications reaches the critical crack size.