An interactive simulation program for swing-to-bunch feller-bunchers is described. The simulation allows the interactions between the feller-buncher, its operator, and the forest stand to be examined. The operator interface was designed to emulate the actual operating conditions of a feller-buncher. Animated graphics provide feedback to the simulation/feller-buncher operator. The program was developed and currently is run on a graphics oriented RISC processor based computer workstation.