Ronald Borman (6) [Avatar] Offline
Page 58 contains the following statement: 'DRY is one of the SOLID principles (the D)'.

Maybe it should be smilie but the D in SOLID actually stands for 'Dependency inversion principle', one of the five basic Object Oriented Design principles defined by Robert Martin.

The DRY principle was formulated by Dave Thomas and Andy Hunt in their book 'The Pragmatic Programmer'.