There are many unsolved problems that computers could solve if the appropriate software existed. Flight
control systems for aircraft, automated manufacturing systems, and sophisticated avionics systems all
present difficult, nonlinear control problems. Many of these problems are currently unsolvable, not because
current computers are too slow or have too little memory, but simply because it is too difficult to determine
what the program should do. If a computer could learn to solve the problems through trial and error, that
would be of great practical value.
