Öz
This study investigates the effect of organizational justice which is perceived by the employees on their motivations. The research is carried out with 392 participants working in a public institution serving in Çankırı. This research also compares linear modelling and fuzzy logic models in the context of contributing to the literature. In order to test the effect of organizational justice on the internal and external motivation of employees, a multiple regression analysis was performed first. Then, the relationship between variables was evaluated by fuzzy logic qualitative comparative analysis (fsQCA). Finally, the results of the two methods were compared. Multiple regression analysis results showed that interactional justice has a significant and positive effect on internal motivation, whereas interactional and distributed justice has a significant and correct effect on external motivation. fsQCA results showed that only interactional and distributed justice had an effect on internal motivation. In this context, the effect of interactional justice on international motivation has been confirmed by the results of two methods. Since the effect of distributed justice on internal or external motivation is found different by two different methods, it has not been fully understood.