Reserves of teaching staff's productivity growth based on lean technologies Alena Alexandrovna Borisova, Victoria Alexandrovna Vinichenko, Ekaterina Vladimirovna Spiridonova and Elena Nikolaevna Kirichenko SHS Web Conf., 125 (2021) 05004 Published online: 23 November 2021 DOI: 10.1051/shsconf/202112505004