Development in context: Comparing short-term trajectories of expectancy, task values, and costs in four university STEM courses

University students studying science, technology, engineering, and mathematics (STEM) tend to lose motivation, on average, over time. However, detailed understanding of when and how students are most likely to lose motivation, as well as whether motivational trajectories differ across contexts, is lacking. Accordingly, we investigated trajectories of expectancy, task values, and perceived costs in four introductory STEM courses (N = 2,104). Latent change score models revealed nuanced patterns of change, indicating average motivational declines in expectancy and task values and average increases in cost perceptions observed in prior research tend to occur primarily at the beginning of the semester. Motivational trajectories also differed in the shape and timing of mean changes across the four STEM courses, suggesting motivational loss trends may not be universal. Variation in trajectories also related to course performance and major persistence, with different motivational beliefs playing different roles at various times in the semester. Findings highlighted the importance of early course performance in predicting motivational change, as well as the importance of motivational changes for short- and long-term outcomes. Findings underscore the contextualized nature of motivational constructs, as both change patterns and relations to correlates differed across settings, indicating a need for researchers to carefully consider how samples are aggregated and further uncover contextual features that shape motivation. Overall, our study findings add essential understanding of motivational strengths and needs in real-world classroom contexts, with implications for the design and timing of intervention for instructors by examining what developmental patterns are common across settings and which are more particular to specific settings.