A differentiation can be made for the software functions in control units between the different language levels (refer to Language levels). There is in particular, a standardization level where the software engineering standards for documentation, specifications for variables and parameters, C-headers, the C-source and for operating system instructions are to be found.
Figure 2: Language levels
The standardization at this level is practiced in many standardization projects, such as MSR-AG MEDOC, MSR-AG Code Generators and OSEK (refer to Standardization projects ).
Figure 3: Standardization projects
A standardization has already taken place at the lowest level: ASAP2 File and Hex File.