1. A computer-implemented method for test planning and test case generation, the method comprising: creating, by a processor, a plurality of content space specification files based on a plurality of requirements; processing, by the processor, the plurality of content space specification files to generate a plurality of user stories; defining, by the processor, a content space for representing a portion of the software via a set of dimensions; traversing, by the processor, the content space to generate the user stories, wherein the content space includes a plurality of cells, each of the plurality of cells corresponding to one of the plurality of user stories, each of the plurality of cells having multiple dimensions, each of the multiple dimensions having one or more values, the multiple dimensions including release, noun, verb, interface, and platform, wherein the verb, interface and platform dimensions are orthogonal and noun-specific; outputting, by the processor, the plurality of user stories; and integrating, by the processor, the user stories of the content space into test planning and test case generation, wherein test case generation includes mapping the content space into test models that are defined by a valid combination of the multiple dimensions.