This paper describes the process, which is illustrated with some practical examples, including in particular the role of technical budgets to derive requirements on subsystems. Also, the provisions taken for the requirements verification are discussed.
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J. C. Gonzalez, H. Kurlandczyk, C. Schmid, D. Schneller, "E-ELT requirements flow down," Proc. SPIE 9911, Modeling, Systems Engineering, and Project Management for Astronomy VI, 99110I (18 August 2016);