... 314 Astronomical Data Analysis Software and Systems XIII, eds. F. Ochsenbein, M. Allen, & D. Egret (San Francisco: ASP), 661 . ... The Data Flow System (DFS) supports the science operation model which is in place for the ESO Very Large Telescope in order to globally maximise its efficiency and ensure a high and predictable data quality level. ... It may take up to 6-8 months to test and adopt DFS software components on a given baseline (operating system + compilers). ...