TY JOUR TI Customer-oriented service tools: theoretical and applied aspects KW customer orientation KW customer-oriented service KW customer KW tool KW service quality KW services KW staff KW customer needs KW customer loyalty KW CRM system KW NPS (Net Promoter Score) KW CSI (Customer Satisfaction Index) KW Big Data JO Journal of Applied Research AU Golskaya, J.N. AU Osipova, A.P. PY 2026 IS PB ITBO University