Component Design Principles

Updated 22 Jul 2026

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def
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  principles guiding the internal design of software components to ensure they are maintainable, extensible, and robust
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principles
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  open-closed principle (OCP)
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    a module or component should be open for extension but closed for modification
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    extend functionality without modifying existing internal code
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  Liskov substitution principle (LSP)
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    subclasses should be substitutable for their base classes
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    a component using a base class should continue to function properly when a subclass is substituted
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  dependency inversion principle (DIP)
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    depend on abstractions (interfaces), not on concrete implementations
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    the more a component depends on concrete classes, the harder it is to extend
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  interface segregation principle (ISP)
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    many client-specific interfaces are better than one general-purpose interface
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    create specialized interfaces for major categories of clients; include only relevant operations in each
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related

Linked references 3