FrontMatter -- Preface -- Contents -- Summary -- 1 Current Status of Planetary Protection Policies for Icy Bodies -- 2 Binary Decision Trees -- 3 Hierarchical Decisions for Planetary Protection -- 4 A Geophysical Perspective and Inventory of Habitable Environments on Icy Bodies -- 5 Microbial Metabolism and Physiology -- 6 Necessary Research -- Appendixes -- Appendix A: Letter Requesting This Study -- Appendix B: Current and Prospective Missions to Icy Bodies of Astrobiological Interest -- Appendix C: Event Sequence Diagram for the Determination of Planetary Protection Measures for Missions to Icy Bodies -- Appendix D: Committee and Staff Biographical Information -- Appendix E: Glossary and Abbreviations.