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Why are use-cases counted separately from the other views in the 4+1 architecture?
How are use-cases different from others views?

Christophe
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NK-cell
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    Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Feb 13 '22 at 04:11

1 Answers1

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The 4+1 approach to software architecture has 4 different but complementary views on the systems internals.

The 5th view (+1) differs from the others, as it’s about the system’s externals: the uses cases are about the goals of the system’s actors and how the system fits in the larger picture.

Not related: One could wonder why it’s not called 1+4 instead of 4+1, considering that the other views are difficult to envisage without knowing anything of the goals, the user’s expectations and the needs to address. I guess it’s because it’s called the “4+1 architectural view models” and not the “1+4 software engineering view models” ;-)

Christophe
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