Architecting and designing : UML 2.5 : Diagram views : Sequence diagram : Observation on Sequence diagram
  
Observation on Sequence diagram
The Observation symbol enables you to model textual observations on a Sequence diagram for SysML or UML 2.5. An Observation is differentiated from a Constraint, in that it is not a constraint – it is simply an Observation.
There are two types of Observations:
▪Duration Observation.
▪Time Observation.
See also
Lifelines on Sequence diagram
Messages on Sequence diagram
Generic Line on Sequence diagram
GeneralOrdering on Sequence diagram
Combined fragment on Sequence diagram
ConsiderIgnoreFragment on Sequence diagram
Constraints on Sequence diagram
Coregions on Sequence diagram
ExecutionSpecification on Sequence diagram
Interaction on Sequence diagram
InteractionOperand on Sequence diagram
InteractionUse on Sequence diagram
State Invariant on Sequence diagram
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Sequence diagram