The Basic Tools (plastic chemistry and behavior in processing, the molding machine -- parts and use, the injection mold -- parts and how they work, how the injection molding process works, the cavity pressure curve), Troubleshooting (the root cause method of troubleshooting), Material Related Defects (mismatched color, black specs, splay--moisture, splay--heat), Filling Related Defects (flash, short shots, weld lines, burns, dieseling, elephant skin, orange peel), Packing and Cooling Related Defects (sinks, vacuum voids), Ejection Related Defects (pull, string flash, sticking in the cavity, ejector pin marks), Post Mold Related Defects (warp, dimensional changes).