[SerpentJoe]

I prefer that model for floor numbering, personally. It means if you're on floor N that you're N stories above the ground.

[ibejoeb]

Not that it matters, but I feel the opposite. Barring the presence of subterranean levels, if you're on the ground floor, you are standing on the first literal "floor" of the structure.

[TazeTSchnitzel]

Well, depends which country you live in.

In British English, the first floor is the first above the ground.

In American English, the first floor is the ground.