The Tipo Quattro platform (type four) was a front wheel drive platform co-developed in the 1980s and 1990s and shared by the Saab 9000, Fiat Croma, Lancia Thema, and Alfa Romeo 164. The platform, ultimately in production for fourteen years, was the fifth and largest of Fiat's Tipo platforms, a numbering sequence that began with zero, hence "four" (the four does not refer to its use by four carmakers).