Version of September 11, 2008 1:08 pm Page 1 BabyUML - 005-FirstPage.fm The Common Sense of Object Orientated Programming Trygve Reenskaug Department of Informatics, University of Oslo, Norway Home: http://folk.uio.no/trygver E-mail: Abstract. The essence of object orientation is that networks of communicating objects work together to achieve a common goal. Surely, the common sense of object orien