The term “operational safety” (also known as “safety in use”) is—as already indicated—not unproblematic with regard to the taxonomy of product safety. This applies less to the term itself than to the fact that it should not be used synonymously with the term “product safety”, but is even explicitly subordinate to it and must therefore divide the area of product safety into at least two areas. As a result of considering operational safety, it is thus necessary to define the term “non-operational safety” and to use it where appropriate. Despite this difficulty, the considerations on quantified product safety are transferred to the area of operational safety in this chapter, primarily for systematic reasons.