MS Visio Look a Like Diagrams

No need for any special drawing skills to create professional looking diagrams outside of your knowledge base. ConceptDraw PRO takes care of the technical details, allowing you to focus on your job, not the drawing. ConceptDraw PRO delivers full-functioned alternative to MS Visio. ConceptDraw PRO supports import of Visio files. ConceptDraw PRO supports flowcharting, swimlane, orgchart, project chart, mind map, decision tree, cause and effect, charts and graphs, and many other diagram types.

IDEF9 Standard

Use Case Diagrams technology. An effective management of changes is significantly facilitated by way of definition and documenting of business-requirements.