In a study, we carried out a validation of the Proactive Personality Scale (PPS; Seibert, Crant, & Kraimer, 1999), that measures the inclination to take action and change the environment to realize one’s goals. Participants were 139 employees, working in two companies. The majority of participants were blue-collar workers. The instrument used was a questionnaire. A 7-item version of the scale was constructed. Moreover, by applying confirmatory factor analysis, we demonstrated the distinction between proactivity and other individual difference variables: work-related self-efficacy, self-empowerment, locomotion. Also the predictive validity of the scale was shown. As expected, proactivity influenced organizational citizenship behaviors; it was not correlated instead with organizational commitment and turnover intentions. We discussed this lack of correlation in terms of the category of employees examined (mostly blue-collar workers).