Passage Summary: Joanna thinks Adam shouldn't judge because of a conflict of interest. Mariah disagrees with Joanna's reasons but agrees with her conclusion because Adam doesn't know how to grade essays.

Conclusion: Adam should not be a judge for the essay contest.

Reasoning: Although the potential for bias is mitigated by anonymous grading and a lack of personal friendships with the entrants, Adam lacks the necessary experience to critique essays.

Analysis: Mariah reaches the same conclusion as Joanna but for a different reason. To justify Mariah's argument, we need a principle that makes 'lack of experience' a sufficient reason to disqualify someone from judging. Look for a rule that bridges the gap between the premise (lack of experience) and the conclusion (should not judge). A strong candidate would be a principle stating that relevant expertise is a mandatory requirement for any individual serving as a judge in a competition.