In what notation do you describe business processes? Can everything be described through BPMN? Provide examples when other methods are needed.

BPMN (Business Process Model and Notation) is a standard for graphical description of business processes, which is well suited for modeling sequences of tasks, events, decisions, and workflows.

However, not all business processes are conveniently described in BPMN:

• Complex rules and logic: if a process contains many conditions, rules, or calculations, it is better to use specialized rule languages (e.g., DMN).
• Architectural or system aspects: for describing technical interactions and architecture, UML diagrams are more commonly used.
• Processes heavily dependent on data: sometimes it is more convenient to use data flow diagrams or ER diagrams.

Example: if you need to describe credit scoring business rules, BPMN can be cumbersome; it is better to use DMN. For describing interactions between systems — UML sequence diagrams.

Thus, BPMN is excellent for visualizing workflows, but for comprehensive description of business logic and architecture, additional notations are often required.