• 1. Introduction
  • 2. Requirements Engineering
  • 3. The State of the Art of RE in the Literature
  • 3.1. Analyzed aspects
  • 3.2. Sources of RE-approaches: Product Engineering
  • 3.3. Sources of RE-approaches: Software Engineering
  • 3.4. Sources of RE-approaches: Service Engineering
  • 4. Conclusion
  • 5. Limitations and Outlook for Future Work
  • 6. References