This volume will give a systematic exposition of known results for free actions by finite groups on S.This volume will give a systematic exposition of known results for free actions by finite groups on S. The text begins with preliminary material on Seifert manifolds and group classification. This is followed by sections dealing with related topics including free bZe/2 and bZe/3 actions on lens/prism manifolds, the reduction theorem and tangential structure.This volume will give a systematic exposition of known results for free actions by finite groups on S. The text begins with preliminary material on Seifert manifolds and group classification. This is followed by sections dealing with related topics including free bZe/2 and bZe/3 actions on lens/prism manifolds, the reduction theorem and tangential structure.This volume will give a systematic exposition of known results for free actions by finite groups on S. The text begins with preliminary material on Seifert manifolds and group classification. This is followed by sections dealing with related topics including free bZe/2 and bZe/3 actions on lens/prism manifolds, the reduction theorem and tangential structure.1. Introduction; 2. Seifert manifolds; 3. Groups with periodic cohomology; 4. Free C2 and C3 actions on certain Seifert manifolds; 5. The reduction theorem; 6. Tangenital structure; 7. SL(2, F5); 7. Finite Poincare complexes and homology spheres; 8. Workpoints.