Hence, the aim of this article is to propose a behavioral definition of individuals’ performance through WIL. To do so, the research investigated whether WIL students develop proficient, adaptive, and proactive performance behaviors toward the task and the team in the workplace and whether these behaviors may be used as variables to assess student-workers performance. To investigate these questions, two steps were proposed. We first examined the behavioral-related dimensions of performance on 1,310 students enrolled in cooperative education (co-op; a form of WIL) (second to fourth year) in a North American university, with regard to the duration of work-experience Second, we compared the results of these behavioral-related dimensions of performance on the 547 co-op students with four months of experience from the previous sample, with a sample of 617 non -co-op students with four months of work experience. We first present the supported theory, then explain the method, and finally highlight and discuss our results in order to provide theoretical implications as well as limitations and recommendations for future research.