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Description
Flashcards by cheekymonky52, updated more than 1 year ago
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Created by cheekymonky52
over 11 years ago
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| Question | Answer |
| What is a closed architecture? | A layer can access the services of the layer directly below is. Reduces dependencies and minimises impact of change. |
| What is a open architecture? | Layers can access services from any layers below it. Makes code more compact as the services of the lower layers can be accessed directly. But it break encapsulation so increase dependencies between layers. |
| What is coupling? | Coupling is how much modules need to know about other modules. This should be minimised in order to make future changes easier. Can be measured by looking at the number of calls between modules. |
| What is cohesion? | Cohesion is how related elements within a module are. This should be maximised to ensure that the subcomponents of a module do belong together. Can be measured by counting the number of internal calls. |
| What are the characteristics of a layered architecture? | N-number of layers (common is 3 tier i.e. presentation, application, storage). |
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