1. A computer-implemented method for managing user story requirements, the method comprising: collecting, by a processor, a plurality of requirements; creating, by the processor, a plurality of content space specification files that includes the plurality of requirements; processing, by the processor, the plurality of content space specification files to generate a plurality of content space-based testable units; and managing, by the processor, the plurality of requirements to reduce gaps and overlap between individual content space testable units in the plurality of content space-based testable units.