So, each Context Reference element named in a scenario step is modeled as a Lifeline.All the elements involved in the scenario must be identified in the 'Context Reference' tab that is, relationships must already exist between the scenario parent element and the other elements named in the scenario (t he Scenario is a Process, and the Sequence diagram is showing the flow of messaging between different Lifelines for that to happen the lifeline/object has to be defined, which is achieved using a Context Reference).There are a number of points to note in this process: When you create a scenario on an element and then generate a Sequence diagram, an Interaction is created as a child of the selected element to act as a container for the diagrams - the Basic, Alternate and Exception paths are each modeled as a separate Sequence diagram under the Interaction.
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