At the risk of getting the metaphorical "hook" for expressing the thought, we are about to engage in herding CATs. Most instrument pilots are lucky and only have to deal with one category of ILS approach during their lives. The Category I, or "CAT I"is usually the only kind of instrument landing system approach minima youcan fly down to as a single pilot operator in the IFR world.
This is a companion discussion topic for the original entry at https://www.avweb.com/flight-safety/technique/categories-of-the-ils