rootbrowseIAC-21D1session 55. Lessons Learned in Space Systems: Achievements, Challenges, Best Practices, Standards.Papers2. Lessons Learned in Systems Engineering Availability and Recommendations for Mission Technical Leaders3. Project Efficiency: a different success criteria for Space Systems projects4. From Life Cycle Assessment of Space Systems to Environmental Communication and Reporting5. The path towards the future of the New-Old Space industry6. Statistical Reliability Analysis of Large Satellites: A decade in review