Front Matter -- Preface -- Contents -- Executive Summary -- 2 Introduction -- 3 NASA's Safety Process For The National Space Transportation System Program -- 4 Risk Assessment and Risk Management: The Committee's View -- 5 National Space Transportation System Risk Assessment and Risk Management: discussion and Recommendations -- 6 Lessons Learned -- Appendix A Acronyms and Definitions -- Appendix B Establishing Reports and Documents -- Appendix C Letter Reports to the Administrator of NASA and NASA Response -- Appendix D Probabilistic Risk Assessment -- Appendix E An Improved Critical Item Risk Assessment Procedure for the National Space Transportation System -- Appendix F Description of Proposed Systems Safety Engineering Functions in Support of National Space Transportation System Risk Assessment and Risk Management.