TY JOUR TI Practical use of the multilevel planning model as a method of managing the life cycle of a construction project KW construction project life cycle KW construction project management KW multi-level planning model KW calendar-network planning KW efficiency improvement of management processes KW contractual model of project implementation JO Construction and Architecture AU Oparina, L.A. AU Barzygin, E.A. PY 2024 IS 12 PB Publishing Center RIOR