Device: description of the main elements, connections between them, arrangement of elements, etc. (with reference to drawing positions). In static and dynamic states. Description of the method - presence of an action or a set of actions, the order of performing such actions over time (sequentially, together, in various combinations), i.e., it is necessary not only to list the actions but also to indicate their sequence. Conditions for performing actions: actions must be performed on material objects using material objects.