"Version: 20240701"--Title page verso.Includes bibliographical references.1. Introduction -- 1.1. Slip system and dislocations -- 1.2. Multiscale modeling of crystal plasticity and the meso-scale gap -- 1.3. CDD and why this book?2. What are dislocation densities? -- 2.1. Defects and their densities -- 2.2. Fine grained dislocation density -- 2.3. Coarse grained dislocation density--extensive d…