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In object-oriented computer programming the term SOLID is a mnemonic acronym for five design principles intended to make software designs more understandable, flexible and maintainable. It is not related to the GRASP software design principles

Concepts

• Single responsibility principle
  • a class should have only a single responsibility (i.e. changes to only one part of the software’s specification should be able to affect the specification of the class).
• Open/closed principle
  • “software entities … should be open for extension, but closed for modification.”
• Liskov substitution principle
  • “objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.” See also design by contract.
• Interface segregation principle
  • “many client-specific interfaces are better than one general-purpose interface.”[4]
• Dependency inversion principle
  • one should “depend upon abstractions, [not] concretions.”