Oberon-D = Object-Oriented System + Object-Oriented Database

Introducing object-oriented programming to old-style programmers is a rather hard task. This paper shows how this job was done at BMD Steyr, Austrians leading producer of accountancy software. A special course for former Cobol programmers was offered. This course is based on the principle that one should first learn data abstraction before one starts with object-oriented programming. Its structure is rather similar to a lecture which was given by the author together with Hanspeter Mössenböck at the University of Linz. The main differences are the removal of academic terms and the focus on Delphi.