分类： Unified Modeling Language

Entity Relationship (ER) diagrams provide a powerful way to visually represent the data requirements of a system and the relationships between different entities. They are particularly useful in database design, where understanding the relationships between various entities is critical to creating an efficient and effective database structure. ER diagrams help to identify the different entities, their attributes, and the relationships that exist between them, providing a comprehensive overview of the data model.

This case study focuses on the use case modeling of an ATM system for a bank. The ATM system is designed to provide customers with a convenient way to access their accounts and perform various banking transactions, such as withdrawing cash, depositing cash, transferring funds, checking their account balance, and changing their PIN.