Quality Control
Initially very erratic - just trying to sort out problems preventing data being taken at all.
Many small changes to spectrograph alignment, focus, wavelength range.
Very little feedback possible prior to 6dFDR
Now more stable but still need real-time S/N calculator to determine exposure times
Biggest problem acquisition.
No astronomer present for bulk of 6dFGS observations
poor feedback loop timescales
6dF complex and delicate instrument, must expect variable quality at some level.