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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.