In recent years, the concept of sustainable development has gained popularity, which
is also reflected in project management. For the development of sustainable project management, the task of forming a project team that is able to provide the criteria for sustainability-a
balance of economic, social and environmental indicators and effects, both in the current period of time and in the long term. The hypothesis proved in our study is that flexible teams are
best suited for sustainable projects. However, the scientific and practical problem is that there
are no recommendations on the competence of the flexible team of a sustainable project. The
purpose of the research is to substantiate the set of competencies of a flexible team of a sustainable project and suggest ways to form them. The research methods were a functional analysis of the activities of sustainable project teams and an expert survey of project managers. Functional analysis of activities was carried out in 16 project teams of 12 enterprises.155
managers and specialists of project teams of different enterprises in Russia took part in the
expert survey. A model of competencies that provide both classical project management functions and team functions for sustainable and flexible project management is proposed. It is
proved that in order to ensure project sustainability criteria, team members must have such
competencies as planning, monitoring and achieving environmental, social and economic
indicators of sustainability, the ability to promptly take into account the dynamic interests of
different stakeholders, and the ability to manage the project in the context of environmental
and social responsibility of business. It also shows the impact on the effectiveness of projects
of such competencies as the ability to combine different functions, be interchangeable team
members, timely and qualitatively modify their competencies to meet the dynamic factors of
the project environment. In other words, the role of team flexibility as a factor of project performance has been proven. There are defined the main directions of formation of these competencies through project communications, team building, formation of project culture and
project thinking, and formation of skills for sustainable project management.