Category: Unified Modeling Language

A use case describes how a user uses a system to accomplish a specific goal. A use case diagram consists of a system, related use cases, and actors, and relates them to each other in order to visualize: what is being described? (the system), who is using the system? (actor) and what the actor wants to achieve? (use case), so that use cases help ensure that the right system is developed by capturing the requirements from the user’s perspective.

Visual Paradigm Online (VP Online) Express Edition a is free online graphing software developed for the community. Draw free diagrams with easy-to-use online drawing tools without watermarks and limitations such as number of diagrams, project file size, etc. You own the diagrams created for personal and non-commercial purposes.

A package is a grouping of model elements which means that a package can contain model elements of different kinds, including other packages to create hierarchies. A package defines a namespace for its contents using for various purposes.