The inputs needed for the cards for each scan in an observe file are specified using JObserve. JObserve has several different "lists" into which new scans can be inserted. The list which will form the observe file is the Observe List. However, because there may be multiple scans with the same source (and other parameters) throughout an observation, it is useful to set up the parameters for these scans in the Source List first, and then to paste these scans into the Observe List. Scans are copied and pasted to/from the Paste List. The fourth list, that of User Defaults, is used for setting up LOs and other observing parameters for user-specified (non-NRAO default) frequencies for continuum and spectral line observations.