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Questions and Answers
What type of systems are primarily driven by data, with relatively little external event processing?
What type of systems are primarily driven by data, with relatively little external event processing?
Data-processing systems
What type of systems are often event-driven, with minimal data processing?
What type of systems are often event-driven, with minimal data processing?
Real-time systems
What is the primary purpose of data-driven models?
What is the primary purpose of data-driven models?
To show the sequence of actions involved in processing input data and generating an associated output
What is an example of an event that may cause a transition from one state to another in a system?
What is an example of an event that may cause a transition from one state to another in a system?
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What type of models show the system's responses to stimuli?
What type of models show the system's responses to stimuli?
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What is represented by nodes in a state machine model?
What is represented by nodes in a state machine model?
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What is the purpose of event-driven modeling?
What is the purpose of event-driven modeling?
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What is an example of a system that can be modeled using a state machine model?
What is an example of a system that can be modeled using a state machine model?
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What is the name of the diagram used to represent state machine models?
What is the name of the diagram used to represent state machine models?
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What type of information is represented by arcs between nodes in a state machine model?
What type of information is represented by arcs between nodes in a state machine model?
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Study Notes
System Modeling
- Context models show the other systems in the environment, but not how the system being developed is used in that environment.
- Process models reveal how the system being developed is used in broader business processes.
- UML activity diagrams can be used to define business process models.
Process Perspective
- Process models focus on the system's interactions with other systems and the environment.
- Modeling the system's interaction with the environment helps identify user requirements.
Interaction Models
- Modeling user interaction is important for identifying user requirements.
- Modeling system-to-system interaction highlights communication problems that may arise.
- Modeling component interaction helps understand if a proposed system structure will deliver required performance and dependability.
- Use case diagrams and sequence diagrams can be used for interaction modeling.
Use Case Modeling
- Use cases represent discrete tasks that involve external interaction with a system.
- Actors in a use case can be people or other systems.
- Use cases are represented diagramatically to provide an overview and in a more detailed textual form.
- A use case example: "Transfer data" in the MHC-PMS, involving the actors "Medical receptionist" and "Patient records system (PRS)".
Sequence Diagrams
- Sequence diagrams are part of the UML and model interactions between actors and objects within a system.
- A sequence diagram shows the sequence of interactions during a particular use case or use case instance.
- Objects and actors are listed along the top of the diagram, with a dotted line drawn vertically from them.
- Interactions between objects are indicated by annotated arrows.
Structural Models
- Structural models display the organization of a system in terms of its components and their relationships.
- Structural models can be static (showing system design) or dynamic (showing system organization during execution).
- Events may have associated data, although this is not always the case.
Data-Driven Modeling
- Data-driven models show the sequence of actions involved in processing input data and generating associated output.
- They are particularly useful during the analysis of requirements as they can show end-to-end processing in a system.
Event-Driven Modeling
- Real-time systems are often event-driven, with minimal data processing.
- Event-driven modeling shows how a system responds to external and internal events.
- It is based on the assumption that a system has a finite number of states and that events (stimuli) may cause a transition from one state to another.
State Machine Models
- State machine models show the behavior of the system in response to external and internal events.
- They show system states as nodes and events as arcs between these nodes.
- When an event occurs, the system moves from one state to another.
- State charts are an integral part of the UML and are used to represent state machine models.
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Description
This quiz covers system modeling, particularly context models and process models, and their applications in business process models using UML activity diagrams.
