Answer :
Final Answer:
Activation bars are set over lifelines in a system sequence diagram to indicate the period of time when a participant is active in the interaction.
Explanation:
Activation bars in a system sequence diagram play a crucial role in visualizing the timeline of an interaction between different participants or objects in a system. These bars are placed over lifelines, which represent the participants involved in the interaction. The purpose of activation bars is to illustrate when a particular participant is actively engaged in the interaction and when it is idle or waiting for a response.
Activation bars consist of horizontal lines drawn over the lifelines, and they extend horizontally to cover the portion of the lifeline where the participant is active. This visual representation helps stakeholders and developers understand the sequence and timing of actions within the system. When an activation bar is present, it indicates that the corresponding participant is performing some action or processing information during that period.
In a system sequence diagram, multiple participants may have their activation bars overlapping or occurring at different times, showing the concurrent or sequential nature of the interaction. This visual clarity enhances communication and comprehension when designing or analyzing system behavior.
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