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Image to be added soon from text book figure 13.3
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In a strict layered architecture, a layer only calls upon the services of the layer directly below it. This design is common in network protocol stacks, but not in information systems.
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The large-scale organization of the software classes into packages (or namespaces), subsystems, and layers is called logical architecture.
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The layers of an architecture are said to represent the vertical slices and support separation of concenrs at larg scale. While Partitions represent a horizontal division of relatively parallel subsystems of a layer.
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An architecture is:
