Scott P. Robertson John M. Carroll Robert L. Mack Mary Beth Rosson Sherman R. Alpert Jürgen Koenemann-Belliveau ODE: A Self-Guided, Scenario-Based Learning Environment for Object-Oriented Design Principles. 51-64 1994 conf/oopsla/1994 OOPSLA db/conf/oopsla/oopsla94.html#RobertsonCMRAK94 http://doi.acm.org/10.1145/191080.191091