A paper presented to the 1990 International Planetarium Society Conference, Borlange, Sweden, by Mark C. Petersen, Loch Ness Productions.
Details follow and refer to the chart below.
The specification they came up with was called MIDI, for Musical Instrument Digital Interface. Now in the planetarium industry, three companies have combined efforts and agreed upon a method of classifying planetariums by their capabilities to present modern audio-visual planetarium programs. With such a list prepared, we can now use it ourselves. For Loch Ness Productions, we can classify the shows we produce. It's a kind of shopping list.