Dynamic and Fixed-Date Scheduling
Most projects on the VLA are observed dynamically, based on a combination of the scheduling priority and the expected properties of the array and the weather. Such dynamic scheduling enhances science data quality and the array's ability to discharge time-sensitive science. Some projects requiring coordinated observations with other telescopes will be scheduled on a fixed date.
For further information, see the scheduling officers' home page at http://science.nrao.edu/facilities/evla/sched/schedsoc