Next: VLT Data Quality Control . Up: Dataflow and Scheduling . ... A key challenge for ESO's Very Large Telescope (VLT) will be responding to changing observing conditions in order to maximize the scientific productivity of the observatory. For queued observations, the nightly scheduling will be performed by staff astronomers using an Operational Toolkit. ... The MTS, developed by ESO, will be used to create candidate lists of observations (queues) based on different scheduling criteria. ...