It is one of the engineer's responsibilities to assess the societal, individual, economic, and ecological risks of the technical systems and processes they develop. This book outlines ways to achieve objective evaluation results through mathematically logical thinking, while not overlooking the human factor as the most significant influence. It addresses decision-making problems of varying scales and demonstrates which proven methods are appropriate for different levels of decision-making in a financially reasonable manner. Drawing from their years of experience in science and industry, the authors describe important and practical evaluation methods along with their theoretical foundations.