# Seven principles of design patterns


By [rojeck](https://paragraph.com/@rojeckluo) · 2021-11-08

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There are seven basic principles of object-oriented design patterns：

    Open Closed Principle (Open Closed Principle, OCP)
    Single Responsibility Principle (Single Responsibility Principle, SRP)
    Liskov Substitution Principle (LSP)
    Dependency Inversion Principle (DIP)
    Interface Segregation Principle (ISP)
    Composite/Aggregate Reuse Principle (CARP)
    Least Knowledge Principle (LKP) or Law of Demeter (LOD)

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*Originally published on [rojeck](https://paragraph.com/@rojeckluo/seven-principles-of-design-patterns)*