rootbrowseIAC-13D1session 55. Lessons Learned in Space SystemsPapers1. Historic Lessons Learned from Space Tethers and Solution - From Gemini11 to Space elevator -2. Systems Engineering Challenges and Lessons Learned from a Space Monkey Project3. Lessons learned from three university experiments onboard the REXUS/BEXUS sounding rockets and stratospheric balloons4. Design and reliability analysis of heterogeneous fault-tolerant on-board computer for micro-satellites5. Telecom 2 lessons learned - How satellite design and operation handling fits with End of life requirements6. Lessons Learned developing a 3U Communication CubeSat7. lessons learned and follow-ups to educational cubesat projects gained in the pw-sat project