Fourth step of the implemented scenario: Visitor overrules the system and a nurse is alerted. This sequence diagram visualizes the different actions taken during the fourth step of the scenario realized by the implemented prototype. In this step, a visitor adjusts the light level in the room and thus overrules the system. The light sensor in the room notices the change in light intensity and publishes this Event on the SCB. This Event matches with the filter rule of the Home Automation Component, which receives this Event and reasons that the light level cannot be adjusted to the needs of the patient as the component has been overruled. However, this Event also matches with the new filter rule that the oNCS Application Component registered in step 3 of this scenario. The oNCS Application Component derives that the light level is above the threshold for patients with a concussion and uses reasoning to find the most appropriate nurse to alert. The “par” indicates that the different application components can perform these actions in parallel.