Abstract: Methods of making fatigue block cycle test specifications for components and/or subsystems are provided herein. In one example, the method includes providing a damage histogram having a plurality of block range sections and defining relative damage corresponding with each of a plurality of range-mean pairs. The plurality of range-mean pairs is determined from one or more time histories of road test events. The plurality of range-mean pairs is distributed over the plurality of block range sections. A largest range range-mean pair is selected in an upper-most block range section of the plurality of block range sections. A highest damage value first range-mean pair is selected in an intermediate block range section of the plurality of block range sections.