Generalized Plasticity deals with the expansion of Unified Strength Theory to Plasticity Theory, leading to a unified treatment - of metal plasticity for Tresca materials, Huber-von-Mises materials and twin-shear materials, - of geomaterial plasticity for Mohr-Coulomb materials and generalized twin-shear materials, - of metal plasticity and plasticity of geomaterials, generally. The book is based on lectures given at Xian Jiaotong University, China and Nanyang Technological University, Singapore. It addresses researchers and students in Civil Engineering and Mechanics.