1.What is diagram consistent?
-In your design, you must make sure the Use Case diagram, Sequence Diagram, Class Diagram, Object Diagram are consisted together
2.Elements to Be Consisted
-All the methods/use cases in these diagrams must be matched in the quantity and name. Any addition or remove of a method/use case in a diagram will cause other diagrams need to be adjusted.
-The methods/use cases name in use case diagram and class diagram must be 100% same. But, in the class diagram, we use smallCamel format.
-The methods/use cases name in the sequence diagram should be Verb or Verb phase, try to match the their names as in the use case diagram as much as possible.
-Activity Diagram is the natural flow of actions to complete a Use Case. An activity is a Verb or V phrase doesnt need to follow the consistence rule above.