Disaster Planning must be Risk-based to be effective in dealing with the emergency situations. The book " Nothing is Perfect" discusses Risk-based Disaster Planning using different methods for identification and quantification of different disaster scenarios both onsite and offsite. Chapters included are failure analysis of safety critical equipment used as barriers from accident and various analysis methods, Root Cause Analysis techniques, scenario modeling for fire, explosion and toxic emergencies and various consequence models like BLEVE, fire, explosion, toxic effects. Also added special chapters on risk from liquefied gases, rescue and evacuation planning based on the use of crisis/evacuation mappings; transport emergency planning, disaster recovery process and business continuity planning. Lessons leaned from mock-drills and actual disaster case studies are highlighted. The book would certainly be useful to students of engineering and management apart from industrial safety and other professionals. Also local authorities and local population centers will be benefited from the information contained in the book. Institutional and Industrial libraries would find it suitable as a reference.