It is important to notice that Use Case Diagrams are not suited to represent the design, and cannot describe the internals of a system. Use Case Diagrams are meant to facilitate the communication with the future users of the system, and with the customer, and are specially helpful to determine the required features the system is to have. Use Case Diagrams tell, what the system should do but do not & mdash; and cannot & mdash; specify how this is to be achieved.
É importante decatarse de que os diagramas de casos de uso non son apropriados para representar o deseño, e non poden descreber o interior dun sistema. Estes diagramas serven para facilitar a comunicación cos futuros usuarios do sistema, e cos clientes, e son especialmente úteis para determinar as funcionalidades que o sistema debe ter. Os diagramas de casos de uso indican o que o sistema debera ter, pero non especifica como o acada, & mdash; nen podemdash;.