Mistakes that could lead to a System Failure

Few mistakes that could lead to a system failure when you are writing the code for an application:

1) Ignore understanding business logic.
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2) Ignore the impacts of a change in code (look for temporary bug fix).
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3) Write un-clean and long code in a single file.
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4) Inconsistent with class and variables naming.
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5) Unnecessary use of external libraries.