11. As a result, legacy systems are typically modernized incrementally. 12. Legacy systems & services need to be modified in order to be tested on cloud.13. Andreas Hein, from the University of Stuttgart, researched the use of legacy systems in space exploration. 14. Legacy systems may perform adequately even though they were not professionally designed as a coherent system.15. The main challenge is that there are often many desktop tools, some new, some legacy system . 16. The service framework must also respect legacy systems . 17. Though the original proposal included a downgrading mechanism for legacy systems , this has now been dropped. 18. Using this top ontology as a basis, a systematic process for re-engineering legacy systems was developed. 19. An RCS emulation layer is also planned for CVSNT / EVS 3.1 to support legacy systems . 20. And com-panies will still need people for general maintenance of their legacy systems long after 2000.
