Dysfunctions in role performance have been associated with a large number of consequences, almost always negative, which affect the well-being of workers and the functioning of organizations. An individual's experience of receiving incompatible or conflicting requests (role conflict) and/or the lack of enough information to carry out his/her job (role ambiguity) are causes of role stress. According to previous theory, role ambiguity and conflict decrease workers' performance and are positively related to the probability of workers leaving the organization. Job satisfaction refers to a positive evaluation of a job, while organizational commitment refers to an employee's attachment to the organization. The affective dimensions of organizational commitment and job satisfaction are considered to be important predictors of turnover intention, absenteeism, and job performance. In the literature, role conflict and ambiguity have been proposed as determining factors of workers' job satisfaction and their commitment towards the organization. The role of job satisfaction and organizational commitment were analysed as variables that should mediate between role ambiguity and conflict and employees' behaviour. The hypotheses were confirmed by means of path analysis carried out with data obtained from a sample of Spanish blue-collar workers employed by a bus company and a water supply company. Role stressors were negatively related to affective commitment mediated through job satisfaction. Affective commitment to the organization exerted a positive influence on performance and reduces the withdrawal behaviour analysed— intention to leave and absenteeism—although the strongest predictor of intention to leave was, in this study, job satisfaction.