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During machine studies and trouble-shooting in the LEP machine various optical parameters must be computed, which can be found quickly using the MAD program. However, the LEP operators are not all well acquainted with MAD. In order to ease their task, a simple interface called the LEP model has been written to run on the Apollo workstations of the LEP control system. It prepares jobs for MAD, sends them to a DN 10000 node for execution, and optionally plots the results. The desired machine positions and optical parameters vary between LEP runs. The LEP model contains a powerful selection algorithm which permits easy reference to any combination of positions and optical parameters in the machine. Elements can be chosen by name, by sequence number, or by element class. The choice of optical functions includes closed orbit, Twiss parameters, betatron phases, chromatic functions, element excitations, and many more. Recently matching features have been added. Communication with the control system and with MAD uses self-describing tables, i.e. tables whose columns are labelled with their name and a format code. Experience with this LEP model interface is reported.
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