There are usually 3 levels of Context diagrams Level 0 context diagrams are the highest level of context diagrams and show a system in the context of its environment. They provide a broad overview of the system and its relationships with external entities. Level 1 context diagrams are more detailed than level 0 context diagrams, and show more of the internal components of the system. They provide a more detailed view of the system and its interactions with external entities. Level 2 context diagrams are even more detailed than level 1 context diagrams, and show the relationships between the internal components of the system in more detail. They provide a very detailed view of the system and its interactions with external entities. In general, context diagrams can be created at different levels of detail to provide a clear view of the system at different levels of abstraction. The level of detail in a context diagram should be appropriate for the needs of the audience and the purpose of the diagram.