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Precisely defined terms and metrics as well as a reliable base of information are the foundation for integrated maturity assessment of complex electronic systems. In this paper, a method is proposed for defining and quantifying multiple relations between systems, functions, requirements, and test cases, allowing to improve traceability in the specification documents and to define terms like test progress, test coverage and system maturity formally. The method is based on an extended generic data model replacing commonly used hierarchical data models for storing function specifications and test artifacts. The key feature are allocation matrices for realizing weighted n:m-relations between systems, requirements, and test cases. Theses matrices represent the distributed systems according to the vehicle network architecture, as well as the requirement coverage of the specified test cases.