Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An Interface Control Drawing or Interface Control Document (ICD) in systems engineering and software engineering, describes the interface of interfaces to a system or subsystem. An application programming interface is a form of ICD, in that it describes how to access the functions and services provided by a system via an interface. If a system producer wants others to be able to use the system, an ICD (or equivalent) is a worthwhile investment. An ICD should only describe the interface itself, and not the characteristics of the systems which use it to connect. The function and logic of those systems should be described in their own design documents if required. In this way, independent teams can develop the connecting systems which use the interface specified, without regard to how other systems will react to data and signals which are sent over the interface.

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