The author explores an assumption evident in the literature that "most" college instructors grade participation in undergraduate courses. Instructors (N = 521) at a large, northeastern university were surveyed regarding their attitudes and practices in grading participation in undergraduate courses. A survey instrument was developed for the purpose of this study and subjected to principal components analysis. This instrument yielded seven subscales of acceptable reliability (Cronbach's alpha greater than or equal to 0.70), three of which are the focus of this article. Results suggest that the majority of instructors across disciplines do incorporate a "participation" factor into students' final course grades. Course level is not a significant correlate, but some differences may be observed by discipline. Underlying instructor beliefs are examined, and implications and future directions for research are discussed. (Contains 1 figure and 7 tables.)