Abstract
With Pascal waning in popularity as the CS1 language of choice, many colleges and universities are considering the adoption of C++ (an imperative and object-oriented hybrid language) as its replacement. An important issue that must be addressed in making such a change is the question of what software design methodology should be taught to CS1 students. Two common answers are (i) continue teaching structured design in CS1 and switch to object-oriented design in CS2; or (ii) teach object-oriented design from the outset in CS1. We believe that both of these approaches have significant drawbacks. To avoid these drawbacks, this paper describes a graduated approach to object-oriented design that we call object-centered design . The approach introduces students to object-oriented design by the end of CS2 without an abrupt paradigm shift, and without requiring an early introduction of inheritance.
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