MGED is one of BRL-CAD's modeling interface application. It undoubtedly has bugs. It's your job to find one, but do so in a manner that is so obvious that one of the other devs will be able to instantly reproduce the bug given your specific instructions. Find a way to make archer crash, become unresponsive, or otherwise behave incorrectly. You will have to explore the tool with minimal documentation.

This task involves filing a bug report with verifiable and reproducible steps that clearly demonstrate the bug. It can't be a bug already reported or otherwise documented nor can it be merely behavior you don't like.

References:

• mged
• Introduction to MGED at http://brlcad.org/wiki/Documentation (many of the mged commands are available in some fashion within archer)
• BUGS file in any source/binary distribution
• http://sourceforge.net/tracker/?atid=640802&group_id=105292&func=browse