... affecting machines and their designers is most often filed under negligence or strict liability theories, both of which may allege the presence of a defect Thus a major concern of designers would ... representations of performance and operation (implied warranty); conduct of designers, manufacturers, sellers, and users (negligence); and the characteristics of the product exclusive of the conduct of all ... Processes The use of special processes or handling, such as methods of cleaning castings, impregnation of castings to prevent leakage of fluids, degreasing of finished parts, or protection of surfaces,...