Abstract
After running a business and defining its formal routine, the informal structure will be created simultaneously so that no manager can prevent emerging it. In other words, there are many various companies and enterprises that follow both formal and informal structures and no corporation can be found without one or both mentioned structure(s). Among the aforesaid corporations, those which their top-managers decide to have a well-networked organization will be able to attain their objective and obtain the competitive advantage. Furthermore, in an organization, the informal structures may accelerate or reduce the work processes and it's so important that the structure will be well-established and robust enough to enable the employees to handle the related jobs. On the other hand, both formal and informal organizations are vital for running a business and assure the survival of the enterprise in a competitive environment; but sometimes one of these two structures probably interfere the work procedures or approaches. In this case, mitigating the negative impacts of informal organizations will be necessary for the future of the enterprises. Thus, in this research, we have focused on the advantages of formal and informal organizations and then we have analyzed the impacts of informal organizations on formal routines by measuring the above-mentioned impacts.