Observations on the Observer Pattern

UPDATED: 16 feb 2011
A group of students who should have been familiar with basic design principles and MVC all failed to implement the Observer design pattern correctly while at the same time violating several design principles. This paper discusses what went wrong and why it probably went wrong. Possible suggestions are given for teaching the Observer pattern and for teaching design patterns in general.

Please find the final version (which is also published in the proceedings of the PLoP Conference), here: Observer.pdf.

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