A prototype arc welding training simulator was designed to provide immediate, discriminative feedback and the capacity for concentrated practice. Two randomly selected groups of welding trainees were compared to evaluate the simulator, one group being trained using the simulator and the other using conventional practice. Preliminary data indicated that with substantially less welding practice and combined welding/simulator practice, simulator trainees performed as well as conventionally trained subjects. Appendixes include an analysis of welding skill development, a description of the simulator, and simulator modifications and new features. (Author/NH)