Overview:
This artifact captures system-wide requirements not captured in scenarios or use cases, including requirements on quality attributes and global functional requirements.

Main Description:

Supporting Requirements and Use Cases, together, define the system requirements. Use Cases describe the behavioral requirements for the system, and Supporting Requirements describe system-wide requirements that are not captured within the Use-Case Specifications. Making this distinction simplifies maintenance.

Supporting Requirements may be categorized according to the FURPS+ model (Functional, Usability, Reliability, Performance, Supportability + Constraints).