Backus later worked on a function-level programming language known as FP, which was described in his Turing Award lecture "Can Programming be Liberated from the von Neumann Style?".
Kasnije je radio na programskom jeziku na razini funkcija poznatom kao FP koji je opisan u njegovoj lekciji prilikom primitka Turingove nagrade “Može li programiranje biti oslobođeno od von Neumannova stila?”