A Formative Evaluation of Scenario-Based Tools for Learning Object-Oriented Design
   Examines how a set of object-oriented design learning tools developed by Rosson and Carroll facilitate active learning. Published in ACM Crossroads.
   http://www.acm.org/crossroads/xrds5-1/eval.html

Dr Ledgard's OOP Site
   Contains an introduction to object oriented programming concepts based with examples in C++. Also includes a glossary, interactive quizzes and references.
   http://www.eecs.utoledo.edu/~ledgard/oop/mainpage.html

Object Discovery Corporation
   provides public courses and on-site training in C++, CORBA, Java, Enterprise JavaBeans, OOAD, UML and Object Oriented Business Process Reengineering.
   http://www.objectdiscovery.com/

Object Mentor Inc.
   Provides training to object oriented developers looking to accelerate development with methodologies such as XP and advanced software design principles. Site provides articles, download, and courses information.
   http://www.objectmentor.com/