FrontMatter -- Preface -- Acknowledgment of Reviewers -- Contents -- Executive Summary -- 1 Radiation Risks and the Vision for Space Exploration -- 2 Specifying and Predicting the Space Radiation Environment -- 3 Operational Strategies for Space Weather Support -- 4 Summary and Workshop Conclusions -- Appendixes -- A Reports of the Working Groups -- B Statement of Task -- C Workshop Participants and Agenda -- D Biographies of Committee Members and Staff -- E Acronyms.