Question

5a. What is UML
b. UML 2.0 provides 13 different diagram for use in software modelling. With the aid of appropriate diagrams, briefly discuss any four of them.

Answer 1

a) Uml stands for Unified Modeling language. UML 2.0 is most advanced version and incorporate agile practices. Original UML specifies 9 diagrams but uml 2.0 has 13 diagrams. UML diagrams or UML is used to visualise and represent a system along with its main actors, roles, actions, classes in order to maintain and understand the system order. This is programming language used for Object Oriented software development.

UML diagrams

1) CLass diagram = These are the backbone of all OOP methods including this UML. They describe the static and outermost structure of the system. It shows relationship between classes, objects, attributes, and operations.

Classes represent an abstraction of entities with common characteristics. Classes are illustrated in a rectangle having partitions with its name at top, list attribute in second partition, and write operations in 3rd partitions.

Class Name

attributes

operations

2) Object Diagram

These diagrams describe the static structure of system at particular time. Can be used to test class diagrams for accuracy.

3) Timing Diagram

This diagram is a type of behavioral or interaction UML diagram that focuses on processes that take place during a specified period of time. They are special instance of sequence diagram , except time is shown to increase from left to right instead of top down.

4) Communication Diagram

These are model that interact between objects in sequence. They describe both the static and dynamic structure of system.

5) Sequence diagram

These describe interactions among classes in terms of an exchange of messages over time.