In documenting a system delimitation, which diagram is least suited for representation?

In the context of documenting a system delimitation, the context diagram with data flows is particularly effective because it visually represents the system's boundaries, the external entities interacting with it, and the data flows between these entities and the system. This clarity helps stakeholders understand what is included in the system and what lies outside its boundaries.

On the other hand, while class diagrams, use case diagrams, and state diagrams have their own merits, they are not as focused on the concept of system delimitation. A class diagram primarily illustrates the structure of the system by detailing classes, attributes, and relationships but doesn't emphasize the external interactions or boundaries as clearly as a context diagram does. Use case diagrams capture functional requirements and user interactions, which may not directly illustrate system limits. State diagrams represent the states of objects within the system and how they change over time, which again does not provide a clear representation of system boundaries.

Therefore, a state diagram is the least suited for representing system delimitation, as it focuses more on the behavior of components within the system rather than defining the system's boundaries and interactions with external entities.