Understanding Activity Diagrams

What is the primary purpose of an activity diagram?

• To analyze the performance of a system.

• To create user interface designs.

• To model the workflow of a system and illustrate the sequence of activities.

• To define the data structure of a system.

Which notation is commonly used to represent activities in an activity diagram?

• Rounded rectangles

• Squares

• Ovals

• Diamonds

How do decision nodes function in an activity diagram?

• Decision nodes are used to combine multiple activities into one.

• Decision nodes represent the end of an activity.

• Decision nodes indicate the start of a process.

• Decision nodes function as branching points that direct the flow of activities based on conditions.

What symbol is used to represent the start of an activity in an activity diagram?

• Filled black circle

• Filled white square

• Dashed rectangle

• Empty circle

Can activity diagrams be used to model parallel processes?

• Yes, but only for single-threaded applications.

• No, activity diagrams can only model sequential processes.

• Yes, activity diagrams can be used to model parallel processes.

• No, activity diagrams are not suitable for any type of process.

What is the difference between an activity and an action in an activity diagram?

• An action represents a high-level process, while an activity is a detailed step.

• An activity is always completed before an action starts.

• Action states are atomic; activity states can be decomposed.

• An activity is a single task, while an action is a collection of tasks.

How are transitions represented in an activity diagram?

• Transitions are indicated by labels above the activities.

• Transitions are represented by arrows connecting activities or states.

• Transitions are represented by circles around activities.

• Transitions are shown as dotted lines between states.

What role do swimlanes play in activity diagrams?

• Swimlanes help organize activities by participant roles in activity diagrams.

• Swimlanes indicate the priority of tasks in activity diagrams.

• Swimlanes represent the flow of data in activity diagrams.

• Swimlanes are used to display the timeline of activities.

In what scenarios would you choose to use an activity diagram over a flowchart?

• Activity diagrams are best for linear processes without parallel activities.

• Use activity diagrams for complex processes with multiple actors and parallel activities.

• Use flowcharts for simple processes with a single actor.

• Choose flowcharts when documenting software requirements.

What are the key components that must be included in a complete activity diagram?

• Initial state, action nodes, flow arrows, choice nodes, conclusion nodes, task groups.

• Start node, process states, flow lines, outcome nodes, end node, task lanes.

• Initial node, activity states, transitions, decision nodes, merge nodes, final node, swimlanes.

• Entry point, operation states, connection lines, selection nodes, termination node, role lanes.