  An approach is introduced, which supports a testing technician in the
identification of possibly untested behavior of control software of fully
integrated automated production systems (aPS). Based on an approach for guided
semi-automatic system testing, execution traces are recorded during testing,
allowing a subsequent coverage assessment. As the behavior of an aPS is highly
dependent on the software, omitted system behavior can be identified and
assessed for criticality. Through close cooperation with industry, this
approach represents the first coverage assessment approach for system testing
in production automation to be applied on real industrial objects and evaluated
by industrial experts.
