Dijkstra:Separate Program in Layers... E.W.Dijkstra (1968-2002): ◆ "...Correct arrangement of the structure of software systems before simple programming...' ◆Layered Structure Programs are grouped into layers Programs in one layer can only communicate with programs in adjoining layers Conceptual integrity ■ Each layer has its own goal With easier development and -↓ maintenance Object Oriented Analysis and Design 7Object Oriented Analysis and Design 7 Dijkstra: Separate Program in Layers... w E. W. Dijkstra (1968-2002): w ‘’...Correct arrangement of the structure of software systems before simple programming...‘’ w Layered Structure § Programs are grouped into layers § Programs in one layer can only communicate with programs in adjoining layers w Conceptual integrity § Each layer has its own goal § With easier development and maintenance