This full research paper analyzes 2,489 peer and self-evaluation responses from senior engineering capstone design courses across 14 evaluation waves and four cohort years (2019--2025) to examine how students evaluate teammate effectiveness in their own words. Using an inductive thematic analysis of open-ended peer and self-evaluation comments alongside descriptive summaries of productivity ratings, we identify eight recurring themes in student-authored evaluations of teammate performance. Contrary to assumptions common in engineering education research, students most frequently describe effective teammates in terms of concrete technical outputs rather than communication or collaboration process. Peer and self-evaluations diverge systematically, with students describing their own professional conduct far more prominently than peers do. Thematic structure was stable across all cohort years including the recent emergence of generative AI tools, with saturation reached early and sustained through 2025. These findings provide a
student-centered taxonomy of teammate behaviors, reveal gaps between student evaluative language and professional teamwork frameworks, and suggest ways to refine peer evaluation instruments and instructional practices to surface under-recognized competencies.
http://orcid.org/https://0000-0001-7272-0507
Texas A&M University
[biography]
The full paper will be available to logged in and registered conference attendees once the conference starts on June 21, 2026, and to all visitors after the conference ends on June 24, 2026