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For a building block, the characteristics visible only in the whitebox view are:

• Code structure of the building block (D)
• Algorithms used in the building block (E)
• Implementation details for the security requirements of the building blocks (G)

The blackbox view suffices for:

• Public interfaces of the building block (A)
• Test coverage based on unit tests for sub building blocks contained in the building block (B)
• Test coverage based on integration tests ©
• Security requirements of the building blocks (F)

In software architecture, the whitebox view reveals the internal workings of a building block, including its code structure, algorithms, and specific implementation details1. This view is essential when the internal structure and behavior of the component need to be understood or modified.

On the other hand, the blackbox view treats the building block as an opaque entity, focusing on its exposed interfaces and observable behaviors without revealing its internal structure2. This view is sufficient for understanding what the building block does from an external perspective, such as its public interfaces and how well it performs its functions as determined by testing.

Here’s a breakdown of the characteristics:

• Whitebox View:
• Blackbox View:

References:

• arc42 Documentation on Building Block View1.
• Stack Overflow discussion on the difference between black box and white box in component diagrams2.
• Flylib Section on Black-Box and White-Box Component Views3.

Documenting the right views in software architecture is crucial for addressing different stakeholder concerns and ensuring the architecture is comprehensible and manageable.

• A: Deployment view illustrates the physical deployment of software on hardware and is essential for understanding how different parts of the system are distributed across platforms and environments.
• C: Runtime view shows how various components of the system interact at runtime, which is vital for understanding system behavior and performance under different operational conditions.
• H: Building-block view (also known as the module view) describes the static organization of the software in modules or components, including their responsibilities and relationships. This view is foundational for developers and maintainers.

References:

The performance of a system often competes with its:

• Flexibility (A) - True1
• Memory usage (B) - True1
• On-time completion of the project C - False
• Adaptability (D) - True1
• Usability (E) - True1
• Security (F) - True1
• Testability (G) - True

In system design, performance trade-offs are a critical consideration. Here’s an explanation of how each listed aspect competes with system performance:

• Flexibility (A): Systems designed for high performance may be less flexible because they are optimized for specific tasks or conditions1.
• Memory Usage (B): High-performance systems may require more memory to store data and instructions for rapid access, which can be at odds with limited memory resources1.
• On-time Completion of the Project ©: While performance considerations can impact project timelines, they do not inherently compete with the on-time completion of a project.
• Adaptability (D): Systems that need to perform well under varying conditions may sacrifice adaptability, as they are tightly coupled with their performance optimizations1.
• Usability (E): Sometimes, the pursuit of performance can lead to complex user interfaces or workflows, affecting usability negatively1.
• Security (F): Security measures can introduce additional processing and checks, potentially slowing down system performance1.
• Testability (G): High-performance systems may be harder to test due to their complexity and the need for specialized testing environments or tools1.

These trade-offs highlight the importance of balancing different system attributes to meet the overall goals and constraints of a project.

References:

• CodingDrills article on Trade-Offs in System Design1