Hello fellow TechNetters, I am getting into the world of SMT and am coming up with somewhat of a basic question, at least I believe so. Is there any one standard/definition of the different types of PWB assembly? I seem to find that pure SM is labeled as Type I, and from there, it looses any cohesion from what I see. I had originally heard that Type I was pure SM, Type II was a combination of SM and TH, with variations, and Type III was pure TH. Any guidance here would be appreciated. Richard Hamilton Clemar Mfg. / Rain Bird [log in to unmask]