This chapter discusses the concept of Standardized Work (SW) as one of the basic tools in implementing Lean Manufacturing for improving processes and reducing variation, analyzing its origins and evolution, and its importance and success factors. The tools that make up the implementation of the SW are also described. In addition, a bibliometric review of SW is conducted to identify the main authors who have worked on the tool, the number of citations, and the journals that have led publications in SW. Finally, an application case in ethylene vinyl acetate (EVA) manufacturing aims to reduce variations and ensure that operations are customized and controlled. The results obtained were adequate, with a 15% improvement in productivity. The SW tools were structured with the participation of the people involved and allowed for ideal conditions before applying other Lean Manufacturing tools.