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4. ECE 355 system decomposition
ECE 355 system decomposition
13
Computer Science
Undergraduate 4
04/12/2012

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Term
what are 6 typical design trade-offs?
Definition
1. functionality vs usability
2. cost vs robustness
3. efficiency vs portability
4. rapid development vs functionality
5. cost vs re-usability
6. backward compatibility vs readability
Term
what's the point of system design?
Definition
to transform analysis model to system design model
Term
what are 3 steps for system design?
Definition
1. identify design goals
2. model the new system design as a set of subsystems using decomposition
3. address major design goals
Term
what's coupling and coherence?
Definition
1. coupling measures dependency among subsystems
2. coherence measures dependency among classes
Term
typically to do we want high or low coupling and coherence?
Definition
we want low coupling but we want high coherence
Term
what's the difference between architectural style and software architecture?
Definition
architectural style is a pattern for a subsystem decomposition and software architecture is a instance of architectural style
Term
list 7 architectural styles.
describe each.
what are advantages and disadvantages?
Definition
layered, client/server, 3-tier, p2p, repository, model view controller, pipe and filters
Term
what are two types of hierarchical relationships between subsystems?
what are their UML notations?
Definition
1. layer A "depends on" layer B
2. layer A "calls" layer B

runtime relationship is dashed lines
compile time relationship is solid lines
Term
what's opaque layering and transparent layering?
Definition
opaque layering: each layer can only call operations from layer below
Term
what's design goal for opaque layering?
Definition
maintainability and flexibility
Term
what's design goal for transparent layering?
Definition
runtime efficiency
Term
what is a middleware?
Definition
Term
what's difference between 3-layer and 3-tier architecture?
Definition
3-layer is a style
3-tire is an architecture
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