Whereas relevance-writing interventions have shown effects on students' achievement, a persistent finding is that interventions benefit students with low, but not high, outcome expectancies--a phenomenon that Schwartz et al. (2016) termed the half empty question. In the current mixed-methods study, we investigated the role of undergraduate students' patterns of engagement in a relevance-writing intervention and their relations to biology course achievement. Ninety-six students who were administered four relevance writing assignments were found to manifest two patterns: Students who completed at least 50% of the intervention in a timely manner outperformed those who completed less-then-50% or completed it late, regardless of their pre-intervention motivation. A closer look into individual students' patterns showed diverse perceptions about the relevance-writing tasks.