This technical manual, originally published in hardcover in May 1988 by Promotion Maucotel Plast, provides a detailed methodology for preparing cost estimates for plastic injection‑molded parts and their associated molds. Authored by Maucotel, the work walks readers through the steps of analyzing part geometry, material selection, cycle time, and tooling requirements to arrive at accurate quotation figures. It includes practical examples, tables, and formulas that reflect the industry practices of the late 1980s, making it a useful reference for engineers, estimators, production planners, and other professionals involved in the injection molding sector. Although the text is rooted in the conventions of its era, the underlying principles remain relevant for understanding the fundamentals of cost calculation in plastics manufacturing.