Single responsibility principle
A class should have only a single responsibility, that is, only changes to 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."
Dependency inversion principle
One should "depend upon abstractions, [not] concretions."
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