Teacher-coordinators and worksite mentors of high school work-based learning programs throughout Illinois were the subjects of this study which described worksite mentors' knowledge of teaching work skills to students participating in work-based learning programs and the nature of the training provided to these worksite mentors. There were no statistically significant differences in knowledge of teaching among worksite mentors based on attendance at training. Informal training was offered to worksite mentors most often to acquaint them with work-based learning program procedures. Worksite mentors who did not attend training stated it was not offered while those who attended formal training rated it highly.