This is a modern presentation of the fundamentals of continuum mechanics as applied to the analysis of the plastic flow in metal forming. Metal forming plasticity is an advanced subject of intensive current research, relevant to both materials science and mechanical engineering. It is used for the analysis and modelling of fabrication processes such as forging, extrusion, rolling, and wire and tube drawing. The fundamentals of flow mechanics are explained here before they are applied in a variety of machine-tool design engineering situations. These fundamentals form the basis of all engineering analyses of the plastic flow in metal forming. Worked examples show the variety of metal forming situations, and approximately 200 end-of-chapter problems are also included.