Library System Context diagram illustrates the information flow between the main processes of the system as well as the databases where the information is being stored. The library system context diagram example shows the processes of stock management, reservations management, and loan management and the databases of available books, reservations, and loans. A context diagram is drawn in order to define and clarify the boundaries of the software system. The library system context diagram, sometimes called a level 0 data-flow diagram, identifies the flows of information between the system and external entities. Instead of creating the library system block diagrams from scratch, use EdrawMax pre-defined templates as it provides the right facts and figures that ease the entire process.