Ordered by Ferdinand Porsche to design a production-feasible concept for the new model, Fuhrmann initiated a design study in 1971, eventually yielding the 928 which was the first clean sheet design by the company for its own model; the 356 had evolved from the Volkswagen Beetle, the 911 was an evolution of the 356, the 914 was a joint effort intended as a replacement for the Volkswagen Karmann Ghia and 912, and the 924 was the result of abandoned project by Volkswagen and Audi.