I used this book extensively in writing my Ph.D. thesis introductory chapters on deformation theory. Good clear diagrams helped in reminding me of the long forgotten dislocation theories of my undergraduate studies. It is perfect as an introductory source, small, handy and uncluttered by the large volume of literature on dislocation theory that could have been included. When looking for a particular topic I found that I ended up reading almost the entire book due to the ease in back tracking through the logical sequence of the chapters. Although meant as an introductory text, I have found that it is also an excellent reference source.