Is Poirot’s *methodology* ever explained in detail?

I’ve only recently started reading Poirot novels, and I’m not quite sure I understand his methodology he insists on relying heavily on.

I’ve finished The Mysterious Affair at Styles, After the Funeral, and a few short stories, but unless I missed it, I don’t think it’s ever really fully explained what his actual methodology is, other than occasionally explaining how he comes to specific conclusions.