SOLID (object-oriented design)

In computer programming, SOLID (Single responsibility, Open-closed, Liskov substitution, Interface segregation and Dependency inversion) is a mnemonicacronym introduced by Michael Feathers for the "first five principles" named by Robert C. Martin[1][2] in the early 2000s[3] that stands for five basic principles ofobject-oriented programming and design. 

nitial	Stands for (acronym)	Concept
S	SRP	Single responsibility principle a class should have only a single responsibility (i.e. only one potential change in the software's specification should be able to affect the specification of the class)
O	OCP	Open/closed principle “software entities … should be open for extension, but closed for modification.”
L	LSP	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.
I	ISP	Interface segregation principle “many client-specific interfaces are better than one general-purpose interface.”[4]
D	DIP	Dependency inversion principle one should “Depend upon Abstractions. Do not depend upon concretions.”[4] Dependency injection is one method of following this principle.

COURTESY: http://en.wikipedia.org/wiki/SOLID_(object-oriented_design)

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