The operation interface of the part type is described in the section
Human-Machine-Interface (
<hmi>). The interface, e.g. buttons, switches or displays of the part type is specified in the section
<hmi-spec>. The testing of the operability of the part type is described in the section
<hmi-test>. Further specifications which do not fit in one of the topics mentioned above are given in the section
<add-spec>.