Passage Summary: Skiff gets a promotion if his professor recommends him, and she'll do that if his book is published this year. The author concludes that if the book is actually good, the promotion is a done deal.

Conclusion: If Skiff's book is as high-quality as he claims, he will definitely be promoted.

Reasoning: The Dean will promote Skiff if Nguyen recommends it, and Nguyen will recommend it if the book is published this year. Nguyen is known to keep her promises.

Analysis: We have a logical gap between the quality of the book and the timing of its publication. The premises establish that 'Publication this year' leads to 'Promotion.' However, the conclusion starts with 'If the book is important and well-written.' To make this argument valid, we must bridge that gap. We need an assumption that guarantees that if the book meets Skiff's quality claims, it will indeed be published this year. Without that link, the quality of the writing is irrelevant to the promotion timeline.