Basic Rules to Build Correct UML Diagrams

The unified modeling language (UML) has been designed to be a full standard notation for object oriented modeling. UML has nine types of diagrams class, object, sequence, collaboration, use case, statechart, activity, deployment and, component diagram. All these diagrams together are used to describe one model. There are some basic rules should be followed when drawing a diagram. Also, one diagram could be correct but inconsistence with another. This paper proposed fifteen basic rules that help developers to build correct and consistent UML diagrams.