 This type of diagram according to Kossiakoff (2003) usually "pictures the system at the center, with no details of its interior structure, surrounded by all its interacting systems, environment and activities.The objective of a system context diagram is to focus attention on external factors and events that should be considered in developing a complete set of system requirements and constraints".System context diagrams are related to data flow diagram, and show the interactions between a system and other actors which the system is designed to face.