Investigating the effect of colleague's perceived social Loafing, negative affectivity and perceived organizational justice on employee's social Loafing of west Tehran taxes Administration through organizational commitment

Today, Human resources are known as the most important and valuable reason for organizations’ successes. Social loafing directly leads to reduction of staff performance and their productivity, therefore this research are investigating the effect of colleague's perceived social loafing, negative affectivity and perceived organizational justice on the social loafing of tax administration’s staff in west of Tehran by six theories throughout organizational commitment in the early six month of the year 1394. The current research in terms of purpose is a practical research and in terms of collecting data is a descriptive-survey research of a casual type. In order to calculate the sample volume we have used Morgan and Kerjesey table. According to this point that in each research some of questionnaires do not return in cases, so we have chosen 300 individuals as the sample using random sampling method. The questionnaires have been distributed among them and the number of 270 useful questionnaires has been collected. The statistical analysis has been performed using SPSS and Lisrel software. The results shows that the colleague's perceived social loafing, negative affectivity and each dimensions of the perceived organizational justice has a positive and meaningful effect on organizational commitment and similarly the organizational commitment on the staff’s social loafing. Therefore, all of the theories have been approved finally.