An ICD should only describe the detailed interface documentation itself and not the characteristics of the systems that use it to connect it. The function and logic of these systems should, if necessary, be described in their own requirements and design documents (there are DIDs for all). This allows independent teams to develop connection systems that use the specified interface, regardless of how other systems react to the data and signals sent through the interface. For example, the DCI and the corresponding interface documentation should contain information about the size, format and what is measured by the data, but no definitive significance of the data for a user`s intended use. .