Clean Architecture: A Craftsman's Guide to Software Structure and Design (Robert C. Martin Series)

Basic structures cannot be composed into larger structures unless they themselves are internally consistent, and so the creation of software, just like any artifact of language, is naturally incremental.Software is a very verbose, very precise incantation of how an information system ought to behave.

Every architecture, no matter what it is, partitions possible changes into three categories: local, nonlocal, and architectural.

• A local change can be accomplished by modifying a single element—for example, adding a new business rule to a pricing logic module.


• A nonlocal change requires multiple element modifications but leaves the underlying archite

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