Little research has been conducted on the relationship between job performance and time management. A perception of control over time was positively correlated with students' selfreported academic performance (Macan et al., 1990) and with students' grade point averages according to university records (Britton & Tesser, 1991). In the present study, however, I examined supervisors' ratings of job performance. Despite the paucity of research, the claims of time management consultants and writers of time management books appear logical and lead to the tentative hypothesis that perceived control over time is positively related to supervisors' ratings of job performance.