Clean Architecture



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Clean Architecture A Craftsman’s Guide to Software Structure and Design by Robert C. Martin (z-lib.org)

C o n c lu s i o n
In every case, the best option is for the development organization to recognize 
and avoid its own overconfidence and to start taking the quality of its 
software architecture seriously.
To take software architecture seriously, you need to know what good software 
architecture is. To build a system with a design and an architecture that 
minimize effort and maximize productivity, you need to know which 
attributes of system architecture lead to that end.
That’s what this book is about. It describes what good clean architectures and 
designs look like, so that software developers can build systems that will have 
long profitable lifetimes.
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13
2
A Ta le of Two 
Va lu e s
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Chapter 2 A Tale of Two Values
14
Every software system provides two different values to the stakeholders: 
behavior and structure. Software developers are responsible for ensuring that 
both those values remain high. Unfortunately, they often focus on one to the 
exclusion of the other. Even more unfortunately, they often focus on the lesser 
of the two values, leaving the software system eventually valueless.
B e h av i o r
The first value of software is its behavior. Programmers are hired to make 
machines behave in a way that makes or saves money for the stakeholders. We 
do this by helping the stakeholders develop a functional specification, or 
requirements document. Then we write the code that causes the stakeholder’s 
machines to satisfy those requirements.
When the machine violates those requirements, programmers get their 
debuggers out and fix the problem. 
Many programmers believe that is the entirety of their job. They believe their 
job is to make the machine implement the requirements and to fix any bugs. 
They are sadly mistaken.

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