  This paper presents the application of a meta model and single underlying
model on an applied avionics system design use case. System models, safety
assurance cases and safety requirements are maintained in a central repository.
This enables to link these data which are originally developed in unrelated
tools. By having such a central repository, traceability can be established,
and consistency can be ensured, which leads to less errors and a shorter
development time. A meta model was constructed which matches the central
repository to enable bidirectional synchronization with an external authoring
tool.
