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This SysML diagram example was redesigned from Wikimedia Commons file: Use case restaurant model.svg.
"Use case model of a restaurant business." [commons.wikimedia.org/ wiki/ File:Use_ case_ restaurant_ model.svg]
"The use case diagram describes the usage of a system (subject) by its actors (environment) to achieve a goal, that is
realized by the subject providing a set of services to selected actors. The use case can also be viewed as functionality and/
or capabilities that are accomplished through the interaction between the subject and its actors. Use case diagrams include the use case and actors and the associated communications between them. Actors represent classifier roles that are external to the system that may correspond to users, systems, and or other environmental entities. They may interact either directly or indirectly with the system. The actors are often specialized to represent a taxonomy of user types or external systems." [omg.org/ spec/ SysML/ 1.3/ ]
The SysML diagram example "Use case restaurant model" was drawn using the ConceptDraw PRO diagramming and vector drawing software extended with the SysML solution from the Software Development area of ConceptDraw Solution Park.
Example of SysML use case diagram
Example of SysML use case diagram, use case, requirement diagram, extend path, constraint textual note, communication path, actor,
Used Solutions

systems engineering, sysml SYSML

systems engineering, sysml
The SysML solution helps to present diagrams using Systems Modeling Language; a perfect tool for system engineering.

Use Case Diagrams technology with ConceptDraw PRO

UML Use Case Diagram Sample
Use case diagrams are used at the development of software and systems for definition of functional system requirements or system of systems. Use case diagram presents the consecution of object’s actions (user’s or system’s) which are executed for reaching the definite result.

event-driven process chain diagram, EPC diagram, process chain flowchart Event-driven Process Chain Diagrams

event-driven process chain diagram, EPC diagram, process chain flowchart
Event-driven Process Chain (EPC) Diagram is a type of flowchart widely used for modeling in business engineering and reengineering, business process improvement, and analysis. EPC method was developed within the Architecture of Integrated Information Systems (ARIS) framework.