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-We can look at the software architecture from two

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-main standpoints. There are prescriptive and descriptive software architectures.

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-So what does that mean? A prescriptive architecture captures

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-the design decisions that are made prior to the

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-system's construction. This is what we normally call the

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-as-conceived software architecture. Conversely,

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-a descriptive architecture describes how

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-the system has actually been built. So it's based

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-on observing the system as it is and extracting

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-the architecture from the observation. This is what we call

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-the as-implemented software architecture. And one key point here is

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-that often, these two architectures, the prescriptive and the descriptive

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-architectures end up being different. So let's see why that happens.