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-After this interesting conversation with Neno, let me start
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-the lesson by defining what a software architecture is.
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-And to do that, I'm going to use two
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-seminal definitions. The first one is from Dewayne Perry
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-and Alex Wolf. And they define a software architecture
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-as elements, form and rationale. In this definition, the
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-elements are the what, which means the processes, data,
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-and connectors that compose a software architecture. The form
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-is the how, the set of properties of
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-in relationships among these elements. And, finally, the rationale
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-is the why, the justification for the elements and
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-their relationships. The second definition I want to use
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-is from Mary Shaw and David Garland. And
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-they defined a software architecture as a level of
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-design that involves four main things, a description of
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-elements from which these systems are built, the interactions
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-among those elements, the patterns that guide their composition, and
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-finally, the constraints on these patterns. As you can see, these
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-definitions are fairly similar and there are many more alternative
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-definitions of software architecture. In fact, if we try to search
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-the term software architecture, we get over two million entries.
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-And if we look at the images in the results of
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-the search this is what we get. And I like this
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-sort of graphical depiction because it gives you a clear idea
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-the software architecture are prevalent concept, given the number of
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-results. But they also show you clearly, that software architecture are
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-complex entities, if you look at some of these pictures.
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-And ultimately, they show that software architecture are presented in all
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-kinds of ways including in 3D, if you look at this
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-picture. We cannot clearly cover all of these definitions in one
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-lesson. So what I will do instead, is to introduce
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-a very general definition that encompasses most of the existing ones.