Software Engineering

SOLID (object-oriented design)

This article is about the SOLID principles of object-oriented programming. For the fundamental state of matter, see Solid. For other uses, see Solid (disambiguation).

Principles of Object-Oriented Design
SSingle responsibility principle – SRP
LLiskov substitution principle – LSP
IInterface segregation principle – ISP
DDependency inversion – DI

“In object-oriented computer programmingSOLID is a mnemonic acronym for five design principles intended to make software designs more understandable, flexible, and maintainable. The principles are a subset of many principles promoted by American software engineer and instructor Robert C. Martin,[1][2][3] first introduced in his 2000 paper Design Principles and Design Patterns.[2][4]” (WP)

The SOLID concepts are:

The SOLID acronym was introduced later, around 2004, by Michael Feathers.[11]

“Although the SOLID principles apply to any object-oriented design, they can also form a core philosophy for methodologies such as agile development or adaptive software development.[3]” (WP)

See also


  1. ^ Robert C. Martin“Principles Of OOD” Retrieved 2014-07-17.. (Note the reference to “the first five principles”, although the acronym is not used in this article.) Dates back to at least 2003.
  2. a b Robert C. Martin. “Getting a SOLID start” Retrieved 2013-08-19.
  3. a b Sandi Metz (May 2009). “SOLID Object-Oriented Design”. Retrieved 2019-08-13. Talk given at the 2009 Gotham Ruby Conference.
  4. a b c Martin, Robert C. (2000). “Design Principles and Design Patterns” (PDF). Archived from the original (PDF) on 2015-09-06.
  5. ^ “Single Responsibility Principle” (PDF). Archived from the original (PDF) on 2 February 2015.
  6. ^ Martin, Robert C. (2003). Agile Software Development, Principles, Patterns, and Practices. Prentice Hall. p. 95. ISBN 978-0135974445.
  7. ^ “Open/Closed Principle” (PDF). Archived from the original (PDF) on 5 September 2015.
  8. ^ “Liskov Substitution Principle” (PDF). Archived from the original (PDF) on 5 September 2015.
  9. ^ “Interface Segregation Principle” (PDF). 1996. Archived from the original (PDF) on 5 September 2015.
  10. ^ “Dependency Inversion Principle” (PDF). Archived from the original (PDF) on 5 September 2015.
  11. ^ Martin, Robert (2018). Clean Architecture: A Craftsman’s Guide to Software Structure and Design. p. 58. ISBN 9780134494166.



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