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UML (Unified Modeling Language) is used to display a conceptual view / visualize a systems architecture. UML is a graphical modeling language. UML consist of a set of models and associated rules for using those models to create different types of UML diagrams.

A UML uses the following elements to visualize the system:
  • Actors
  • Business processes
  • (Logical) components
  • Activities
  • Programming language statements
  • Database schemas
  • Reusable software components
Types of UML diagrams:

Use Case Diagrams:

A Use case diagram in UML is the type of diagram used to model behavior. The purpose of a Use Case Diagram is to provide a graphical view of the functionality provided by the system in terms of actors, goals of actors (represented as Use Cases) & dependencies between Use Cases.


Class and Object Diagrams:

Class diagrams show the classes of a system, their inter-relationships (i.e., inheritance, aggregation, and association), Attributes of classes & Operations which can be performed on the classes. Classes are represented by boxes with three sections as follows:
  • Top Section : This has the name of the class
  • Middle Section : This section lists the attributes of the class
  • Last Section : This section lists the methods of the class

Activity Diagram:

Activity Diagrams are used to provide graphical representation of stepwise activities. Activity diagram has support for choice, iteration & concurrency. Essentially an activity diagram shows the overall flow of control.


Sequence and Collaboration Diagram:

A Sequence diagram depicts the sequence of actions that occur in a system. It basically shows how each method in a object is called & the order in which the methods are called. A sequence diagram is made of the following two things:
  • Objects : These are represented as rectangles with underlined names for classes
  • Messages : Interaction between different objects is represented by messages. The notation for a message is a directed arrow

Component Diagram:

A Component diagram shows how components are wired together to form larger components. A component diagram has the following:
  • Assembly Connector : Is a connector between two components that tells us that one component provides the services that the other component requires.
  • Delegation Connector : Is a connector that links the external contract of a component (as specified by its ports) to the internal realization of that behavior by the component's parts

Deployment Diagram:

This model serves to model the physical deployment of artifacts on deployment targets. Instances of nodes (and devices and execution environments) are used in deployment diagrams to indicate multiplicity of these nodes. For example, multiple instances of an application server execution environment may be deployed inside a single device node to represent application server clustering.