● It should go without saying that the focus of UML is modeling. However, what that means,exactly, can be an open-ended question. （71）is a means to capture ideas, relationships,decisions, and requirements in a well-defined notation that can be applied to many differentdomains. Modeling not only means different things to different people, but also it can usedifferent pieces of UML depending on what you are trying to convey. In general, a UML modelis made up of one or more （72）. A diagram graphically represents things, and the relationshipsbetween these things. These （73）can be representations of real-world objects, pure softwareconstructs, or a description of the behavior of some other objects. It is common for an individualthing to show up on multiple diagrams; each diagram represents a particular interest, or view, ofthe thing being modeled. UML 2.0 divides diagrams into two categories: structural diagrams andbehavioral diagrams. （74）are used to capture the physical organization of the things in yoursystem, i.e., how one object relates to another. （75）focus on the behavior of elements in asystem. For example, you can use behavioral diagrams to capture requirements, operations, andinternal state changes for elements.