Solution
| Aspect | Sequence Diagram | Activity Diagram |
|---|---|---|
| Purpose | Shows the chronological flow of messages and interactions between objects over time. | Illustrates the flow of activities, steps, or processes within a system, including decision points and parallel workflows. |
| Focus | Focuses on the order and timing of interactions between specific objects or components. | Focuses on the overall workflow and the sequence of actions performed, often at a higher level of abstraction. |
| Representation | Displays objects (lifelines) vertically and messages horizontally, emphasizing the sequence of communication. | Uses nodes (actions, decisions, start/end points) and edges (transitions) to show the flow of control. |
| Use Case | Best for modeling detailed interaction scenarios between components in a specific use case. | Best for modeling business processes, complex operations, and workflow logic with branching and parallelism. |
| Parallelism | Can show parallel messages but is primarily sequential in nature. | Clearly supports parallel flows, concurrency, and synchronization using fork and join nodes. |
| Example | Showing how a user opens a box, puts toys inside, and then closes the box. | Showing a restaurant order process from "Order Placement" → "Food Preparation" → "Order Delivery". |