SDI1 week8_1

16/03/2010


 
UML (Unified Modelling Language)

UML is a standard language for specifying, visualizing, constructing, and documenting the artefacts of software systems, as well as for business modelling and other non-software systems.

If we define a new system verbally, each project member understands slightly different system. These differences affect project progress, so we have to define system visually.

 
UML diagrams

UML includes 6 types of diagram.

-          Use case diagram

-          Class diagram

-          Interaction diagram

-          State diagram

-          Activity diagram

-          Physical diagram

 
Use case diagram

Use case diagram is helpful in exposing requirements and planning the project. During the initial stage of a project most use cases should be defined, but as the project continues more might become visible.