Figure 2 summarizes operational and communication flow between the PI, JIVE, and various EVN assets during an EVN astronomical experiment. The user deposits SCHED output on VLBEER, from which individual stations draw their observing instructions. Help from JIVE may of course be requested during the scheduling process, especially if any problems are encountered. Following the observations, the stations deposit logs and GPS data on VLBEER, send tapes to JIVE, and post comments to the EVN feedback facility. We pull necessary information off VLBEER and prepare files that will drive the correlation. Our principal control file is in VEX format, and is based on information gathered from the observing schedule, station logs and GPS data, and EOP data from the IERS. We correct scheduled station positions to reflect our best current values, including plate motion computed to the observing epoch. We send e-mail to the PI describing what we envision the correlation of the experiment to entail. The PI has the opportunity to review the correlation parameters (cf equation 1) and all other available information (items with a check in Figure 2 are available via the EVN or JIVE web pages) and writes back to pass along any requests for changes (e.g., improved source coordinates, etc.) and/or confirm that correlation can go ahead.