According to the basic principle of self-developing systems, the interaction parameters of two opposing tendencies of the system operation can be distinguished – the conservative tendency and the changing tendency. It explains the balance of the two activity tendencies of team members – the ability to conserve and the ability to change.On the basis of the Belbin's model, each participant's role structure is determined by means of which the participants' activity tendencies are determined with use of Lotka, Volterra and Gause's self-developing systems. This system is considered according to the types of interactions such as “cooperation” and “competition”.The equilibrium point of role activity trends is determinedto have the most minimal impact that determines the subsequent state of the system maximally. It is shown that the role differentiation of the effective team does not always depend on the number of participants. Each participant may combine the multiple roles that can lead to the balance of conservative and changing tendencies. It defines the conditions of effective work in operational and development in management of project operation and development