Podcast
Questions and Answers
Context models are used to illustrate the ______ context of a system.
Context models are used to illustrate the ______ context of a system.
operational
Social and organisational concerns may affect the decision on where to position ______ boundaries.
Social and organisational concerns may affect the decision on where to position ______ boundaries.
system
Architectural models show the system and its relationship with other ______.
Architectural models show the system and its relationship with other ______.
systems
Process models show the overall ______ and the processes that are supported by the system.
Process models show the overall ______ and the processes that are supported by the system.
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Data flow models may be used to show the ______ and the flow of information from one process to another.
Data flow models may be used to show the ______ and the flow of information from one process to another.
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Two types of behavioural model are: Data processing models that show how data is ______ as it moves through the system;
Two types of behavioural model are: Data processing models that show how data is ______ as it moves through the system;
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State machine models show the system’s response to ______.
State machine models show the system’s response to ______.
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Data flow diagrams (DFDs) may be used to model the system’s ______ processing.
Data flow diagrams (DFDs) may be used to model the system’s ______ processing.
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DFDs are an intrinsic part of many ______ methods.
DFDs are an intrinsic part of many ______ methods.
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Behavioural models are used to describe the overall ______ of a system.
Behavioural models are used to describe the overall ______ of a system.
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Study Notes
System Modelling
- System modelling helps the analyst understand the system's functionality and is used to communicate with customers.
- Different models present the system from different perspectives:
- External perspective showing the system's context or environment.
- Behavioural perspective showing the behaviour of the system.
- Structural perspective showing the system or data architecture.
Model Types
- Data processing model: shows how the data is processed at different stages.
- Composition model: shows how entities are composed of other entities.
- Architectural model: shows principal sub-systems.
- Classification model: shows how entities have common characteristics.
- Stimulus/response model: shows the system's reaction to events.
Context Models
- Context models illustrate the operational context of a system, showing what lies outside the system boundaries.
- Social and organisational concerns may affect the decision on where to position system boundaries.
- Architectural models show the system and its relationship with other systems.
Process Models
- Process models show the overall process and the processes that are supported by the system.
- Data flow models may be used to show the processes and the flow of information from one process to another.
Data Flow Diagrams (DFDs)
- DFDs model the system from a functional perspective.
- DFDs track and document how the data associated with a process is helpful to develop an overall understanding of the system.
- DFDs may also be used to show the data exchange between a system and other systems in its environment.
State Machine Models
- State machine models show the behaviour of the system in response to external and internal events.
- State machine models show system states as nodes and events as arcs between these nodes.
- When an event occurs, the system moves from one state to another.
Statecharts
- Statecharts allow the decomposition of a model into sub-models.
- A brief description of the actions is included following the 'do' in each state.
- Statecharts can be complemented by tables describing the states and the stimuli.
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Description
Learn about data flow diagrams and order processing in software engineering. Understand the functional perspective of DFDs and how they track and document data associated with a process.
