Dataflow programming is exceptional for GUI programming, although I've never tried using it in a large application. This style of programming does its best if

Dataflow programming is exceptional for GUI programming, although I've never tried using it in a large application. This style of programming does its best if it has support from the underlying language to enforce consistency. Without it, it's just too easy to get the program into an unconsistent state. I'm aware of only two implementations providing dataflow programming: Cells for Common Lisp and FrTime for PLT Scheme (but I've actually used only the former).