In addition to product offerings and products, services and resources are also the focus of in business interactions.  For example, one service provider may enter into a lease agreement to use a connection belonging to another service provider; the failure of a network device may precipitate the need to send a notification communicating the need to repair the device to a technician, while another notification must be sent to the service subscribes offering an alternative product offering for use by the subscribers.  The relationship that product, service, and resource business entities have with business interaction is shown in the figure below.<br/>