--- title: "Meaning & Key Takeaway of: The five letters of the SOLID acronym…" description: "\"“The five letters of the SOLID acronym stand for: Single Responsibility Principle: a class should have one and only one responsibility; that is, only o..." image: "https://sms4smile.com/quotes/i/49b/armando-fox-73504_quote_the-five-letters-of-the-solid-acronym-st_954757.jpg" --- # The five letters of the SOLID acronym stand for: Single… ![“The five letters of the SOLID acronym stand for: Single Responsibility Principle: a class should have one and only one responsibility; that is, only one reason to change. The Lack of Cohesion Of Methods metric indicates the antipattern of too large a class. Open/Closed Principle: a class should be…” quote by Armando Fox](https://sms4smile.com/quotes/i/49b/armando-fox-73504_quote_the-five-letters-of-the-solid-acronym-st_954757.jpg) [Download](https://sms4smile.com/quotes/i/49b/armando-fox-73504_quote_the-five-letters-of-the-solid-acronym-st_954757.jpg) [Open image](https://sms4smile.com/quotes/i/49b/armando-fox-73504_quote_the-five-letters-of-the-solid-acronym-st_954757.jpg) > ““The five letters of the SOLID acronym stand for: Single Responsibility Principle: a class should have one and only one responsibility; that is, only one reason to change. The Lack of Cohesion Of Methods metric indicates the antipattern of too large a class. Open/Closed Principle: a class should be open for extension, but closed against modification. The Case Statement design smell suggests a violation. Liskov Substitution Principle: a method designed to work on an object of type T should also work on an object of any subtype of T. That is, all of T’s subtypes should preserve T’s “contract.” The refused bequest design smell often indicates a violation. Dependency Injection Principle: if two classes depend on each other but their implementations may change, it would be better for them to both depend on a separate abstract interface which is “injected” between them. Demeter Principle: a method can call other methods in its own class, and methods on the classes of its own instance variables; everything else is taboo. A design smell that indicates a violation is inappropriate intimacy.”” [Armando Fox](https://sms4smile.com/quotes/author/armando-fox/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. SOLID outlines five design rules to create maintainable, extensible code, warning against common smells like large classes and tight coupling. **In simple terms:** SOLID guides clean code, warns against bad patterns. Key Takeaway Apply SOLID to improve software quality. Themes software engineering design patterns code quality Mood educational technical Type instructional practical When to use this quote - code review - architecture design - team training - refactoring Key Concepts SOLID design smells object‑oriented programming Questions to Reflect On - Which SOLID principle is hardest to practice? - How do you detect design smells early? A Different Perspective Complexity can hinder adoption. ★ ★ ★ ★ ★ No ratings yet [Closed Principle](https://sms4smile.com/quotes/about/closed-principle-1726504/) [Principle](https://sms4smile.com/quotes/about/principle/) [Principle Class](https://sms4smile.com/quotes/about/principle-class-1726501/) [Principle Classes](https://sms4smile.com/quotes/about/principle-classes-1726502/) [Solid Acronym](https://sms4smile.com/quotes/about/solid-acronym-1726503/) ## Related quotes > [“The laws of every country must be analogous to some common principle.”](https://sms4smile.com/quotes/thomas-paine/the-laws-of-every-country-must-be-analogous-to-some-common-principle/) [Thomas Paine](https://sms4smile.com/quotes/author/thomas-paine/) > [We need to protect free trade as a guiding principle for Japan.](https://sms4smile.com/quotes/fumio-kishida/we-need-to-protect-free-trade-as-a-guiding-principle-for-japan/) [Fumio Kishida](https://sms4smile.com/quotes/author/fumio-kishida/) > [To me the female principle is, or at least historically has been, basically anarchic. It values order without constraint, rule by custom not by…](https://sms4smile.com/quotes/ursula-k-le-guin/to-me-the-female-principle-is-or-at-least-historically-has-been/) [Ursula K. Le Guin](https://sms4smile.com/quotes/author/ursula-k-le-guin/) > [Freedom can be preserved only if it is treated as a supreme principle which must not be sacrificed for particular advantages.](https://sms4smile.com/quotes/friedrich-august-von-hayek/freedom-can-be-preserved-only-if-it-is-treated-as-a-supreme-principle/) [Friedrich August von Hayek](https://sms4smile.com/quotes/author/friedrich-august-von-hayek/) > [The one guiding principle over my 23-year career in TV has been as long as I'm having fun, I really don't care what the…](https://sms4smile.com/quotes/andy-cohen/the-one-guiding-principle-over-my-23-year-career-in-tv-has-been-as/) [Andy Cohen](https://sms4smile.com/quotes/author/andy-cohen/) > [“Eventually, there is one principle, and one principle alone on which the world is hinged: things will work out the way they should, provided…](https://sms4smile.com/quotes/manreet-sodhi-someshwar/eventually-there-is-one-principle-and-one-principle-alone-on-which/) [Manreet Sodhi Someshwar](https://sms4smile.com/quotes/author/manreet-sodhi-someshwar/) > [“There is only one tactical principle which is not subject to change. It is: ‘To use the means at hand to inflict the maximum…](https://sms4smile.com/quotes/ladislas-farago/there-is-only-one-tactical-principle-which-is-not-subject-to-change/) [Ladislas Farago](https://sms4smile.com/quotes/author/ladislas-farago/) > [The value of a principle is the number of things it will explain.](https://sms4smile.com/quotes/ralph-waldo-emerson/the-value-of-a-principle-is-the-number-of-things-it-will-explain/) [Ralph Waldo Emerson](https://sms4smile.com/quotes/author/ralph-waldo-emerson/) > [ The fundamental principle \[of settlement work\] remains: that people shall take up their residence in industrial communities, giving what they may have of public… ](https://sms4smile.com/quotes/lillian-wald/the-fundamental-principle-of-settlement-work-remains-that-people/) [Lillian Wald](https://sms4smile.com/quotes/author/lillian-wald/) > [The first principle of cognitive therapy is that all your moods are created by your 'cognitions,' or thoughts. A cognition refers to the way…](https://sms4smile.com/quotes/david-d-burns/the-first-principle-of-cognitive-therapy-is-that-all-your-moods-are/) [David D. Burns](https://sms4smile.com/quotes/author/david-d-burns/) > [In a nation as dynamic and diverse as the United States, what makes us great is that our founding principles are rooted in the…](https://sms4smile.com/quotes/ted-lieu/in-a-nation-as-dynamic-and-diverse-as-the-united-states-what-makes-us/) [Ted Lieu](https://sms4smile.com/quotes/author/ted-lieu/) > [The eternal principle, which never was born, never will die: it is in all things: it is in you now. You are the wave…](https://sms4smile.com/quotes/joseph-campbell/the-eternal-principle-which-never-was-born-never-will-die-it-is-in/) [Joseph Campbell](https://sms4smile.com/quotes/author/joseph-campbell/) > [Too much principle is often more harmful than too little.](https://sms4smile.com/quotes/ellen-glasgow/too-much-principle-is-often-more-harmful-than-too-little/) [Ellen Glasgow](https://sms4smile.com/quotes/author/ellen-glasgow/) > [I'm a principle liberty, rule-of-law Conservative.](https://sms4smile.com/quotes/erin-o-toole/i-m-a-principle-liberty-rule-of-law-conservative/) [Erin O'Toole](https://sms4smile.com/quotes/author/erin-o-toole/) > [It may seem a strange principle to enunciate as the very first requirement in a hospital that it should do the sick no harm.](https://sms4smile.com/quotes/florence-nightingale/it-may-seem-a-strange-principle-to-enunciate-as-the-very-first/) [Florence Nightingale](https://sms4smile.com/quotes/author/florence-nightingale/) ## More by Armando Fox > [“if you cannot describe the responsibility of a class in 25 words or less, it may have more than one responsibility, and the new…](https://sms4smile.com/quotes/armando-fox/if-you-cannot-describe-the-responsibility-of-a-class-in-25-words-or/) [Armando Fox](https://sms4smile.com/quotes/author/armando-fox/) > [“When Ruby programmers say that some class “quacks like an Array,” they usually mean that it’s not necessarily an Array nor a descendant of…](https://sms4smile.com/quotes/armando-fox/when-ruby-programmers-say-that-some-class-quacks-like-an-array-they/) [Armando Fox](https://sms4smile.com/quotes/author/armando-fox/) > [“The purpose of velocity is to give all stakeholders an idea how many iterations it will take a team to add the desired set…](https://sms4smile.com/quotes/armando-fox/the-purpose-of-velocity-is-to-give-all-stakeholders-an-idea-how-many/) [Armando Fox](https://sms4smile.com/quotes/author/armando-fox/) [Explore all 4 Armando Fox quotes ](https://sms4smile.com/quotes/author/armando-fox/) ## More Principle quotes > [“The laws of every country must be analogous to some common principle.”](https://sms4smile.com/quotes/thomas-paine/the-laws-of-every-country-must-be-analogous-to-some-common-principle/) [Thomas Paine](https://sms4smile.com/quotes/author/thomas-paine/) > [I'm a principle liberty, rule-of-law Conservative.](https://sms4smile.com/quotes/erin-o-toole/i-m-a-principle-liberty-rule-of-law-conservative/) [Erin O'Toole](https://sms4smile.com/quotes/author/erin-o-toole/) > [Too much principle is often more harmful than too little.](https://sms4smile.com/quotes/ellen-glasgow/too-much-principle-is-often-more-harmful-than-too-little/) [Ellen Glasgow](https://sms4smile.com/quotes/author/ellen-glasgow/) > [The eternal principle, which never was born, never will die: it is in all things: it is in you now. You are the wave…](https://sms4smile.com/quotes/joseph-campbell/the-eternal-principle-which-never-was-born-never-will-die-it-is-in/) [Joseph Campbell](https://sms4smile.com/quotes/author/joseph-campbell/) > [In a nation as dynamic and diverse as the United States, what makes us great is that our founding principles are rooted in the…](https://sms4smile.com/quotes/ted-lieu/in-a-nation-as-dynamic-and-diverse-as-the-united-states-what-makes-us/) [Ted Lieu](https://sms4smile.com/quotes/author/ted-lieu/) > [The first principle of cognitive therapy is that all your moods are created by your 'cognitions,' or thoughts. A cognition refers to the way…](https://sms4smile.com/quotes/david-d-burns/the-first-principle-of-cognitive-therapy-is-that-all-your-moods-are/) [David D. Burns](https://sms4smile.com/quotes/author/david-d-burns/) > [ The fundamental principle \[of settlement work\] remains: that people shall take up their residence in industrial communities, giving what they may have of public… ](https://sms4smile.com/quotes/lillian-wald/the-fundamental-principle-of-settlement-work-remains-that-people/) [Lillian Wald](https://sms4smile.com/quotes/author/lillian-wald/) > [The value of a principle is the number of things it will explain.](https://sms4smile.com/quotes/ralph-waldo-emerson/the-value-of-a-principle-is-the-number-of-things-it-will-explain/) [Ralph Waldo Emerson](https://sms4smile.com/quotes/author/ralph-waldo-emerson/) > [“There is only one tactical principle which is not subject to change. It is: ‘To use the means at hand to inflict the maximum…](https://sms4smile.com/quotes/ladislas-farago/there-is-only-one-tactical-principle-which-is-not-subject-to-change/) [Ladislas Farago](https://sms4smile.com/quotes/author/ladislas-farago/) > [“Eventually, there is one principle, and one principle alone on which the world is hinged: things will work out the way they should, provided…](https://sms4smile.com/quotes/manreet-sodhi-someshwar/eventually-there-is-one-principle-and-one-principle-alone-on-which/) [Manreet Sodhi Someshwar](https://sms4smile.com/quotes/author/manreet-sodhi-someshwar/) > [The one guiding principle over my 23-year career in TV has been as long as I'm having fun, I really don't care what the…](https://sms4smile.com/quotes/andy-cohen/the-one-guiding-principle-over-my-23-year-career-in-tv-has-been-as/) [Andy Cohen](https://sms4smile.com/quotes/author/andy-cohen/) > [Freedom can be preserved only if it is treated as a supreme principle which must not be sacrificed for particular advantages.](https://sms4smile.com/quotes/friedrich-august-von-hayek/freedom-can-be-preserved-only-if-it-is-treated-as-a-supreme-principle/) [Friedrich August von Hayek](https://sms4smile.com/quotes/author/friedrich-august-von-hayek/) > [To me the female principle is, or at least historically has been, basically anarchic. It values order without constraint, rule by custom not by…](https://sms4smile.com/quotes/ursula-k-le-guin/to-me-the-female-principle-is-or-at-least-historically-has-been/) [Ursula K. Le Guin](https://sms4smile.com/quotes/author/ursula-k-le-guin/) > [We need to protect free trade as a guiding principle for Japan.](https://sms4smile.com/quotes/fumio-kishida/we-need-to-protect-free-trade-as-a-guiding-principle-for-japan/) [Fumio Kishida](https://sms4smile.com/quotes/author/fumio-kishida/) > [It may seem a strange principle to enunciate as the very first requirement in a hospital that it should do the sick no harm.](https://sms4smile.com/quotes/florence-nightingale/it-may-seem-a-strange-principle-to-enunciate-as-the-very-first/) [Florence Nightingale](https://sms4smile.com/quotes/author/florence-nightingale/) [Browse all 904 Principle quotes ](https://sms4smile.com/quotes/about/principle/) ```json { "@context": "https://schema.org", "@graph": [ { "@type": "Quotation", "text": "“The five letters of the SOLID acronym stand for: Single Responsibility Principle: a class should have one and only one responsibility; that is, only one reason to change. 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