The development of project, project and portfolio management systems supports the global acceleration of innovation. Significant changes in the environment require additional research on the effectiveness of the use of existing flexible methodologies, knowledge systems, the competency of project managers and their leadership. The foundation of environmental change lies in changing the decision-making paradigm to flexible project management and innovation development programs. The article examines modern approaches to leadership formation in the application of flexible methodologies, their specificity in terms of decision-making processes in project management. The problems of formation and maintenance of leadership in application of flexibl...