The article presents the results of the research conducted on Positive Organizational Potential and its role as a key factor of companies’ development. The data analyzed in this article come from two stages of the research. In the first part an experts session was conducted to determine the force of the impact of each of 35 selected Development Supporting Employee Behaviours on companies’ development. In the second stage of the research (done by postal survey) 104 leading Polish companies were examined. Respondents in this stage were top-managers, who have rated the intensity of particular employee behaviours identified in their companies and described their company’s performance. This methodology allowed us to compare the identified behaviours with the indicators of development. This research was the first of this type that was carried out in the world, where the specific behaviour influencing development was identified. It is only a starting point for further research, which is to be conducted in the area of management of described relations in business practice.