Architectural Views

Why Multiple Architectural Views?

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Why is it impossible to represent all relevant information about a system's architecture in a single architectural model?

Because requirements change too frequently for a single model to remain valid

Because software tools can only store one diagram per system

Because each model only shows one view or perspective of the system, and different concerns require different perspectives

Because architects lack the skills to draw comprehensive diagrams

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Krutchen's 4+1 View Model

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Krutchen's well-known 4+1 view model proposes four fundamental architectural views related by use cases or scenarios. Match each view with its correct description.

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View

Physical view

Logical view

Development view

Process view

Description

Shows key abstractions in the system as objects or object classes; requirements can be related to entities in this view

Shows how, at run-time, the system is composed of interacting processes; useful for judging non-functional characteristics like performance and availability

Shows how the software is decomposed for development, broken into components implemented by a single developer or team; useful for software managers and programmers

Shows the system hardware and how software components are distributed across processors; useful for systems engineers planning deployment

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The Conceptual View

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Hofmeister et al. added a fifth view called the conceptual view to the four views proposed by Krutchen. Which of the following best describes the purpose of a conceptual view?

It is an abstract view of the system used to decompose high-level requirements into specifications, support decisions about reusable components, and represent a product line rather than a single system

It shows the physical deployment of software components on hardware nodes

It is used exclusively for performance profiling of the running system

It shows the detailed class hierarchy used in object-oriented design

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UML for Architectural Description

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Which of the following statements correctly reflect the role of UML in architectural description? Select ALL that apply.

A 2006 survey found that when UML was used for architecture, it was mostly applied in a loose and informal way

UML is universally agreed to be the best notation for all stages of architectural design

UML was designed primarily for describing object-oriented systems and works best at the implementation level

UML is most valuable when documenting an architecture in detail or using model-driven development

For architectural design, informal notations on a whiteboard are often preferred during the design process itself

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Architectural Description Languages (ADLs)

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What are the basic elements of Architectural Description Languages (ADLs), and what is the main practical limitation of ADLs?

Elements: use cases and scenarios; Limitation: they cannot model non-functional requirements

Elements: classes and methods; Limitation: too verbose for large systems

Elements: data flow diagrams and entity-relationship models; Limitation: they are not supported by any tools

Elements: components and connectors, with rules for well-formed architectures; Limitation: domain and application specialists find them hard to understand and use

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When is Detailed Architectural Documentation Justified?

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In most projects, block diagrams are the only architectural documentation that exists. When is it justified to invest in a more detailed, formal architectural description? Select ALL that apply.

When developing critical systems where a detailed dependability analysis of the system is needed

When it is necessary to convince external regulators that the system conforms to regulations

For every software project regardless of size or criticality

When using model-driven development approaches

Whenever the development team has more than five members

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Purpose of Different Architectural Views

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Which architectural view would be MOST useful to a systems engineer who is planning how to deploy software components across the servers and network infrastructure of an organisation?

Logical view

Development view

Process view

Physical view

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Architectural Views Classification

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Classify each scenario into the architectural view it most naturally belongs to.

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The '+1' in Krutchen's 4+1 Model

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In Krutchen's 4+1 view model, what does the '+1' refer to?

A fifth mandatory view showing database schema

A security analysis view added later by Hofmeister

An optional performance benchmarking view

Use cases or scenarios that relate the four fundamental views to each other

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Block Diagrams — Advantages and Limitations

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Block diagrams are widely used to describe system architectures. Which of the following correctly identifies both an advantage AND a limitation of informal block diagrams?

Advantage: they present a high-level picture that people from different disciplines can readily understand; Limitation: they do not show the type of relationships among components nor their externally visible properties

Advantage: they replace the need for any other documentation; Limitation: they require specialised tools to create

Advantage: they are the only notation with well-defined semantics for architecture; Limitation: they cannot be generated automatically

Advantage: they show the type of all relationships between components; Limitation: they are difficult to draw

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Why Multiple Architectural Views?

Correct Answer

Explanation

Krutchen's 4+1 View Model

View

Description

Correct Answer

Explanation

The Conceptual View

Correct Answer

Explanation

UML for Architectural Description

Correct Answer

Explanation

Architectural Description Languages (ADLs)

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Explanation

When is Detailed Architectural Documentation Justified?

Correct Answer

Explanation

Purpose of Different Architectural Views

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Explanation

Architectural Views Classification

drag and drop the selected option to the right place

Correct Answer

Explanation

The '+1' in Krutchen's 4+1 Model

Correct Answer

Explanation

Block Diagrams — Advantages and Limitations

Correct Answer

Explanation

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