  Scenario-based testing has become a promising approach to overcome the
complexity of real-world traffic for safety assurance of automated vehicles.
Within scenario-based testing, a system under test is confronted with a set of
predefined scenarios. This set shall ensure more efficient testing of an
automated vehicle operating in an open context compared to real-world testing.
However, the question arises if a scenario catalog can cover the open context
sufficiently to allow an argumentation for sufficiently safe driving functions
and how this can be proven. Within this paper, a methodology is proposed to
argue a sufficient completeness of a scenario concept using a goal structured
notation. Thereby, the distinction between completeness and coverage is
discussed. For both, methods are proposed for a streamlined argumentation and
regarding evidence. These methods are applied to a scenario concept and the inD
dataset to prove the usability.
