What business models and diagrams have you encountered in your work experience?

In my experience as a systems analyst, I have encountered several business models and corresponding diagrams:

• Use Case diagrams — for describing user interactions with the system and identifying requirements.
• Class diagrams — for modeling data structures and relationships between objects.
• Sequence diagrams — for illustrating the order of interactions between objects over time.
• BPMN diagrams — for visualizing and optimizing business processes.
• ER diagrams (Entity-Relationship) — for designing databases and defining relationships between entities.

These diagrams help structure requirements, improve communication with the team and clients, and ensure transparency and control over the development process.