An essential tool in the fields of structural geology and geotechnics, stereographic projection allows three-dimensional orientation data to be represented and manipulated. This revised edition presents a basic introduction to the subject with examples, illustrations and exercises that encourage the student to visualize the problems in three dimensions. It will provide students of geology, rock mechanics, and geotechnical and civil engineering with an indispensable guide to the analysis and interpretation of field orientation data. Links to useful web resources and software programs are also provided.