Architecting and designing : SysML : Model Elements : Classifiers : Interaction
  
Interaction
SysML specifies several types of behaviors:
Activity
State Machine
Interaction
Opaque Behavior, which has subtype FunctionBehavior
Interaction is a communication between objects. You model Interactions on Sequence diagrams.
See also
Activity
Actor
Association
DataType
Enumeration
Extension
FunctionBehavior
Information Item
Interface
Opaque Behavior
Primitive Type
Signal
State Machine
Stereotype
Use Case
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Classifiers