Requirements and Architecture Development

The architecture should also display the structure of requirements. With the help of the horizontal abstraction levels described the upper and lower interfaces are predetermined for the details, which the architecture should illustrate. By determining the logical and technical elements, further interfaces within the horizontal abstraction level are displayed. In a system, logical and technical elements are defined, which have the task of carrying or also implementing the required functions. The logical or technical elements have to be clearly specified so that a correct behavior can be expected for safety relevant systems (Fig. 3.12). 

The following characteristic or features should be seen as requirements  

Besides the functional characteristics the following characteristics will have an influence on the electric, electronic and mechanic hardware elements  

But also technical software elements have technical characteristics such as 

Commercial, ideational or emotional aspects are not further regarded here since they should not consider to be related to safety. How these technical values are to be defined and specified is generally also the result of an analysis. 

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